Cooler Master CH351 Wireless Gaming & Mobile Over-Ear Headset – 3D Surround, 2.4GHz, Bluetooth 5.4, 50mm Drivers (Open Sealed)

Description

The Cooler Master CH351 is a versatile over-ear gaming headset designed for PC, console, mobile gaming, movies, communication, and everyday entertainment. It supports three connection methods: low-latency 2.4GHz wireless through the included USB-C transmitter, Bluetooth 5.4, and a conventional 3.5mm wired connection.

Large 50mm drivers deliver full-range gaming and entertainment audio, while built-in 3D surround processing enhances positional sound in supported wireless modes. The detachable unidirectional boom microphone is designed to focus on the user’s voice while reducing keyboard and environmental noise.

Hardware-based sidetone lets users hear their own voice without noticeable monitoring delay, helping them control speaking volume during gaming and calls. A rechargeable battery provides more than 30 hours of wireless playback under Cooler Master’s test conditions.

This unit is sold in Open Sealed condition. The packaging has been opened, so the headset, battery, USB-C transmitter, microphone, cables, controls, and wireless modes should be inspected before delivery.

Key Features

• Over-ear wireless gaming headset
• Standard Space Black color
• Large 50mm dynamic drivers
• Built-in 3D surround sound
• Low-latency 2.4GHz wireless
• Less than 20ms advertised 2.4GHz latency
• Bluetooth 5.4 connectivity
• 3.5mm passive wired connection
• USB-C wireless transmitter
• Up to 20-meter 2.4GHz range
• Pairing memory for up to three Bluetooth devices
• Detachable flexible boom microphone
• Unidirectional microphone pickup
• Hardware-based microphone sidetone
• Dedicated microphone and sidetone control
• Hardware volume control
• More than 30 hours of battery life
• USB Type-C charging
• Steel and plastic headband
• PU-leather and foam headband padding
• Protein-leather ear cushions
• Closed-back circumaural design
• Compatible with PC, PlayStation, Nintendo Switch and mobile devices
• Product number: CH-351
• Condition: Open Sealed

The 50mm drivers, Bluetooth 5.4, 2.4GHz connection, 3.5mm input, sub-20ms latency, microphone specifications, dimensions and battery rating are confirmed by Cooler Master’s official CH351 product page.

Triple-Mode Connectivity

The CH351 provides three ways to connect.

2.4GHz Wireless

The USB-C wireless transmitter provides the lowest-latency wireless connection and is the recommended mode for gaming.

Advantages include:

• Less than 20ms advertised latency
• Up to approximately 20m range
• Wireless microphone support
• 3D surround sound
• Hardware sidetone
• Full headset control access

The quoted latency and range were measured by Cooler Master under laboratory conditions. Real-world performance depends on interference, device placement, walls, USB ports, and the connected platform.

Bluetooth 5.4

Bluetooth is intended for phones, tablets, laptops, and other compatible devices.

It is convenient for:

• Mobile gaming
• Music
• Calls
• Video streaming
• Podcasts
• Online meetings
• Devices with limited USB ports

Bluetooth generally has more audio delay than the dedicated 2.4GHz connection, so 2.4GHz mode is preferable for competitive gaming.

3.5mm Wired

The included analog cable allows passive listening through compatible 3.5mm audio outputs.

Suitable sources include:

• Console controllers
• Laptops
• Desktop computers
• Mobile devices with a headphone socket
• Handheld gaming systems
• DACs and audio interfaces

In analog mode, powered features such as 3D surround, sidetone, wireless microphone operation, and onboard volume controls are disabled. The 3.5mm mode should therefore be treated primarily as a passive audio connection.

Low-Latency 2.4GHz Gaming

The dedicated wireless connection is rated at less than 20ms latency under Cooler Master laboratory testing.

This helps improve synchronization between:

• Gunfire and game action
• Footsteps and movement
• Dialogue and animation
• Racing-game feedback
• Rhythm-game inputs
• Video and audio
• Team communication

The included transmitter uses a USB Type-C interface. Devices with USB-A ports may require a suitable USB-C-to-USB-A adapter if one is not included.

Built-In 3D Surround Sound

The CH351 includes hardware-based 3D surround processing for enhanced spatial presentation.

It can help provide:

• More immersive game environments
• Improved directional awareness
• Wider perceived sound
• More cinematic movie playback
• Clearer separation of effects

The 3D function can be enabled using the dedicated headset control and status indicator.

According to Cooler Master, 3D surround is available only in wireless operation. It is disabled in passive 3.5mm mode.

50mm Dynamic Drivers

The headset uses 50mm drivers with a 20Hz–20,000Hz frequency response.

They are suitable for reproducing:

• Game sound effects
• Dialogue
• Music
• Explosions
• Footsteps
• Environmental audio
• Movies and streaming content

The 32-ohm impedance also allows the headset to operate from ordinary analog headphone outputs when using the 3.5mm cable.

Detachable Unidirectional Microphone

The flexible boom microphone uses a unidirectional pickup pattern designed to focus on speech coming from the front of the microphone.

This helps reduce pickup of:

• Mechanical-keyboard noise
• Mouse clicks
• Room reflections
• Background conversations
• Computer-fan noise

The microphone can be detached when the headset is used for music, travel, or casual listening.

Cooler Master specifies that the boom microphone is enabled in wireless modes. Microphone functionality should not be promised over the passive 3.5mm connection.

Built-In Sidetone

Sidetone sends the user’s microphone voice back through the headset, allowing them to hear how loudly they are speaking.

This can help prevent:

• Shouting during intense games
• Speaking too quietly
• Uneven microphone distance
• Uncomfortable voice monitoring

The hardware implementation provides near-instant monitoring without depending on software.

The microphone button cycles through:

• Microphone on with sidetone on
• Microphone on with sidetone off
• Microphone muted

Sidetone is available only during wireless operation.

Bluetooth Device Switching

The CH351 can pair with up to three Bluetooth devices and allows users to switch between stored devices using the multifunction control.

Possible paired devices include:

• Smartphone
• Tablet
• Laptop

“Up to three devices” refers to stored pairing and convenient switching. It should not automatically be interpreted as playing audio from three devices simultaneously.

Battery Life

The rechargeable battery provides more than 30 hours of wireless playback under Cooler Master’s testing at 50% volume.

Actual battery life depends on:

• Listening volume
• 2.4GHz or Bluetooth operation
• 3D surround usage
• Microphone use
• Sidetone use
• Wireless signal strength
• Battery age and condition
• Operating temperature

The headset should be charged for at least two hours before its first use or initial battery test.

USB-C Charging

The headset includes a USB Type-C charging port.

Charging requirements:

• Standard 5V USB power
• Minimum recommended power: approximately 2.5W
• Maximum required charging power: approximately 5W
• USB-C connection is used for charging
• A high-wattage laptop charger is unnecessary

USB-C is not listed as a digital wired-audio mode. Wired audio uses the separate 3.5mm connection.

Wireless Range

The 2.4GHz wireless transmitter provides up to approximately 20 meters of range under Cooler Master laboratory conditions.

Actual range can be reduced by:

• Walls
• Metal furniture
• USB interference
• Wi-Fi equipment
• Other 2.4GHz devices
• Distance from the transmitter
• Placing a desktop computer under a desk

Connecting the transmitter to an unobstructed front or top USB port may improve performance.

Over-Ear Closed-Back Design

The circumaural ear cups surround the ears and provide passive isolation from room noise.

Construction includes:

• Steel and plastic headband
• PU-leather and foam headband cushion
• Protein-leather ear pads
• Ergonomic Y-frame
• Adjustable fit
• Closed ear cups

The closed-back design helps reduce sound leakage and makes the headset more practical around other people than an open-back model.

Specifications

Platform Compatibility

Suitable for compatible:

• Windows gaming PCs
• macOS computers
• PlayStation 5
• PlayStation 4 with a suitable USB adapter
• Nintendo Switch
• Android phones
• Android tablets
• Apple iPhone
• iPad
• Bluetooth-enabled laptops
• Devices with a 3.5mm headphone output

The regional product listing identifies PC, PS4, PS5, Nintendo Switch, iOS and Android compatibility. CH351 regional product listing

Xbox wireless compatibility is not officially listed. A 3.5mm controller connection may provide passive headphone audio, but powered features and microphone behavior should be tested before advertising Xbox compatibility.

Package Contents

The retail package should include:

• Cooler Master CH351 Headset ×1
• Detachable Unidirectional Boom Microphone ×1
• USB-C 2.4GHz Wireless Transmitter ×1
• 3.5mm Audio Cable ×1
• USB Type-C Charging Cable ×1
• User Manual and Documentation

A USB-C-to-USB-A adapter may vary by regional package. All contents should be physically confirmed because the unit is Open Sealed.

Open Sealed Inspection Checklist

Before delivery, confirm:

• Product is the CH351, not the similarly named CK351 keyboard
• Product number is CH-351
• Correct color matches the packaging
• USB-C 2.4GHz transmitter is included
• Detachable microphone is included
• 3.5mm audio cable is included
• USB-C charging cable is included
• Battery accepts and holds a charge
• Bluetooth pairing works
• 2.4GHz wireless connection works
• Device-switching control works
• Left and right drivers operate correctly
• Channel balance is correct
• No buzzing, static, crackling, or distortion is present
• 3D surround activates
• Sidetone activates and deactivates
• Microphone mute works
• Boom microphone captures clear audio
• Volume control works in wireless mode
• 3.5mm passive audio works
• USB-C port is undamaged
• Headband adjusts correctly
• Ear cushions are clean and undamaged
• Hinges and Y-frame have no cracks
• Wireless range is reasonable
• Previous Bluetooth pairings have been cleared

Important Notes

• The headset supports Bluetooth, 2.4GHz wireless, and 3.5mm audio.
• USB-C is used for charging and the wireless transmitter, not advertised digital wired audio.
• The USB-C transmitter may require an adapter on USB-A-only devices.
• 3D surround is available only in wireless mode.
• Hardware sidetone is available only in wireless mode.
• Cooler Master lists the detachable microphone as a wireless-mode feature.
• Passive 3.5mm mode disables powered controls and effects.
• The quoted sub-20ms latency applies to 2.4GHz mode under laboratory testing.
• The 30-hour battery rating was tested at 50% volume.
• Xbox wireless compatibility is not officially confirmed.
• This is a stereo headset with virtual 3D processing, not a multi-driver physical surround headset.
• Ear-cushion condition and battery health should be checked carefully on an Open Sealed unit.
• Seller warranty should be stated separately.

Best For

• PC gaming
• PlayStation gaming
• Nintendo Switch
• Mobile gaming
• Competitive multiplayer games
• Voice chat
• Movies and video streaming
• Online classes
• Remote work
• Music and podcasts
• Users who switch between multiple devices
• Users who need microphone sidetone
• Wired and wireless gaming setups

Why Choose the Cooler Master CH351?

• Three connection methods
• Low-latency 2.4GHz gaming
• Modern Bluetooth 5.4
• Passive 3.5mm listening
• Large 50mm drivers
• Built-in 3D surround
• Detachable unidirectional microphone
• Hardware-based sidetone
• Up to 20m wireless range
• More than 30 hours of battery life
• USB-C charging
• Pairing memory for three Bluetooth devices
• Over-ear closed-back isolation
• Adjustable ergonomic construction
• Broad PC, console, and mobile compatibility
• Open Sealed condition can provide strong value when fully inspected and tested

• Immersive 3D soundscape: The built-in 3D surround sound delivers an all-encompassing audio experience across all platforms. Elevate your gaming and immerse yourself in a deep, lifelike soundscape.
• Hybrid Wireless: Enjoy flexible connectivity with both wired Type-C and wireless options, 2.4GHz for lag-free performance or Bluetooth 5.4 for convenient and adaptable connection.
• Seamless Bluetooth: Seamlessly pair up to three devices and switch between them with a single button press, keeping your USB ports free for other devices.
• Built-in Sidetone: Take control of your audio experience with real-time, latency-free voice monitoring, seamlessly match levels with your teammates. Toggle it off anytime for complete flexibility.
• Reliable Transmission: Provides up to 20 meters² of transmission range and up to 30 hours of battery life, offering reliable connectivity performance on the go.