Specification: Name: Bone conduction bluetooth-compatible headset Bluetooth-compatible version: 5.0 Speaker type: bone conduction vibrator speaker Battery capacity: 170mAh Endurance: 10-12 hours (distinguished by volume) Transmission distance: 15 meters (unblocked) Charging time: Less than 2 hours Product weight: 15.8 grams Bluetooth-compatible protocol: A2DP or AVRCP or or HFP Supported functions: music play or pause, incoming call answering or rejection, battery display, automatic reconnection, calling voice assistant, caller ID, etc. Product size: about 67mm x 52mm x 12mm or 2.64inch x 2.05inch x 0.47inch Color: Black and red Material: plastic Package Contents: 1 x Headphone Only the above package content, other products are not included. Note: Light reflection 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.