CMF Headphone Pro

Android / iOS devices:
Short-press the Button to activate the Voice Assistant.

Nothing Phone:
The "Button" doesn't activate the Voice Assistant by default. To enable it, open the Nothing X app, go to Controls > Button, and assign either the single press or Press & hold gesture to the Voice Assistant. Once configured, the assigned gesture will activate your Voice Assistant.

For more functions, please download the Nothing X app, available for download on Google Play and iOS App Store.

1. If the headphones have established connections with two phones, and neither phone is in a call / voice conference, the headphones will output the sound of the phone with the incoming call.

2. If the headphones have established connections with two phones, and one of the phones is already in a call:
When the initially inactive phone receives an incoming call, you'll hear the incoming call ringtone on the headphones, and the headphone will prioritise controlling the phone with the incoming call. When you end the current call, the headphones will switch the audio channel to the phone with the incoming call.

Note: Please visit the official Nothing website to learn more about Dual Connection and view the product instructions. Alternatively, contact our Customer Service for assistance.

1. If the headphones establish connections with two devices, and both phones are in an idle state:
a) The headphones will output the sound from the phone that's receiving an incoming call or making an outgoing call.
b) The headphones will output the sound from the phone that starts playing music first.

2. If the headphones establish connections with two devices, and one of the phones is playing back music:
a) The headphones will mute the currently playing music (without pausing it) and then switch to outputting the sound from the device with the incoming or outgoing call. After the call ends, the headphones will switch back to the music-playing connection to resume music playback.
b) No sound channel switching will occur when the device that started playing music later will start music playback.

The gesture controls will affect the device currently outputting audio through the headphones. If there is no audio playing, the controls will operate the last connected device or the device that most recently played audio through the headphones.

1. Auto-reconnection on Power-on / Auto-reconnection on Exiting Sleep Mode

With Dual Connection enabled:
a) When the headphones are powered on and no 3.5mm aux-in cable is inserted, headphones will attempt to reconnect if the number of connected devices is less than two. The reconnection targets the last two devices the headphones were connected to. If the headphones are enabling Dual Connection for the first time and have no prior reconnection records, they will maintain a single-device connection. (In single-connection mode, the headphones will not enter pairing mode automatically; pairing with a new device requires the user to manually press and hold the Bluetooth pairing button.) If the headphones fail to reconnect to other devices, they will remain in single-device connection mode and will not enter pairing mode.
2) After the headphones and your device are disconnected due to exceeding the connection range, the headphones will only reconnect to the phone that was disconnected due to the out-of-range issue if it comes back within the connection range again.
3) The headphones won't trigger reconnection when they are in a call or playing music.
4) If the headphones are in the reconnection state and simultaneously in a call or music playback, they will pause the reconnection within 5 seconds. If the call or music playback ends within the reconnection timeout period, the headphones will resume the paused reconnection until the reconnection times out. After the reconnection times out, the connection to the headphones can only be initiated from the device side.

2. Connection Preemption
When the headphones are in Dual Connection mode, they support connection preemption. The following rules apply when connection preemption occurs:
a) If neither of the two connected phones is in music playback state, the headphones will disconnect from the first-connected phone and connect to the device initiating the preemption.
b) When the headphones enter pairing mode with a new device:
If two devices are already connected, the headphones will disconnect from one of the devices upon entering pairing mode. After disconnecting from one device, the headphones can be detected and connected by the new device.
c) If the headphones are already connected to two devices, and a third device (with a previous connection record) initiates a preemption request, the headphones will disconnect from one of the two currently connected devices. After the disconnection, the third device can preempt and connect to the headphones.

Tips:
Music playback:
1) If one of the two connected phones is in music playback, the headphones will disconnect from the phone that's not in music playback state and connect to the device initiating the preemption.
2) If both phones are in music playback state, the headphones will disconnect from the phone whose music is not outputting through the headphones (i.e., disconnect from the device where music playback is muted) and connect to the device initiating the preemption.

Call state:
If either of the two connected phones is in a call, connection preemption is not allowed.

Press and hold the pairing button on CMF Headphone Pro for 10 seconds. The reset is complete when the red light flashes three times, followed by a flashing white light.

When CMF Headphone Pro is low on battery, we recommend charging it with a standard charger connected to a type-C charging cable. The maximum supported charging power is 5W.

Note: If you're not using your headphones for a while, keep battery level at above 50%.

Bluetooth Connection: Supported audio formats include AAC, SBC, and LDAC (Hi-Res Wireless).

AUX Connection: Supports Hi-Res Wired quality.

Yes, CMF Headphone Pro supports Mircosoft Swift Pair.

Yes, CMF Headphone Pro supports Google Fast Pair.

CMF Headphone Pro supports 3.5mm aux-in wired audio connection but not USB-C Audio.

Yes, CMF Headphone Pro supports Dual Connection. This feature is turned off by default. Go to the Nothing X app to enable and explore more options.