Purchase Guide: If you need language translation function, please choose the model with (AI) mark to place an order Product Details Bluetooth version: BT5.4 Operation Mode: Touch Control Charging time: 1 hour Communication distance: 10-15 meters (no obstacles) Battery capacity (MAH): single headset * 30mAh Material: PC+ABS Size: 54*44.2 mm Smart Touch Operation Guide: Tap headphones: turn off/on music Double-tap left/right headphone: previous/next song Tap left/right headphone three times: decrease/increase volume Tap the headset when there is an incoming call: Answer the incoming call Press and hold the headset for 2 seconds when there is an incoming call: Reject the incoming call Press and hold the touch area of the headset for more than 2 seconds: open the voice assistant. (For details, please refer to the manual) Note: Since everyone has different habits of using the headset, if you encounter problems during use, please contact customer service for professional help. Please note Due to manual measurement, please allow slight measurement deviation. Due to the different monitors and lighting effects, the actual color of the item may be slightly different from the color shown in the picture.