Specification: Name: Bone conduction bluetooth-compatible headset Color: black, red, blue, green 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: <2 hours Product weight: 15.8 grams Bluetooth-compatible protocol: A2DP/ AVRCP/HSP/HFP Supported functions: music play/pause, incoming call answering/rejection, battery display, automatic reconnection, calling siri voice assistant, caller ID, etc. Product size: about 67mm*52mm*12mm/2.64inch*2.05inch*0.47inch Note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-2cm measuring deviation due to manual measurement. Included: 1 * Bluetooth-compatible headset 1 * Charging cable 1 * Instruction