Instructions for use: 1. Power on: Press and hold the power button for more than 3 seconds, the voice prompts "BLUETOOHIMODE", automatically enter the bluetooth mode, and the LED indicator is always on in blue. 2. Power off: When the headset is turned on, press and hold the power button for more than 3 seconds, the voice prompts "POWEROFF", the LED is off, and the device is turned off. 3. Connect the phone: When you have an incoming call, short press the power button. 4. Hang up the phone: during a call, short press the power button. 5. Reject incoming calls: When incoming calls, long press the power button for about 1 second. 6. Redial the last outgoing number: double-click the power button. 7. Play music: Under normal conditions, short press the power button to automatically turn on the smart device to play music Battery capacity: 400mAh, play time up to 10~12 hours, continuous talk time up to 12 hours, standby time up to 148 hours. Material:Metal + Plastic colour:Green Package Contents: 1 * Bluetooth 5.0 headset 1 * USB power cable 1 * 3.5mm AUX audio cable 1 * Microphone cable 1 * Chinese and English manual Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.