Package Includes: 1x Headphones 1x Instruction Manual 1x Charging Cable color: BL09 black box, BL09 red box, BL09 blue box, BL09 green box Bluetooth version: 5.2 Supported protocols: HSP/HFP/A2DP/AVRCP Wireless frequency: 2.4GHZ Bluetooth connection distance: 10 meters Battery capacity: 170mAh Charging voltage/current: 5V/1A Talk time: 15H Music time: 13H Charging time: about 2H Standby time: 90 days Speaker impedance: 10mm 32 Microphone sensitivity: -42Db Packaging: Box Features: Bone conduction: This kind of headphone is comfortable to wear because you dont need to wear it in your ear, not easy to make you feel painful. Wireless: This earphone is designed with bluetooth-compatible V5.2 technology, which provides you with a stable and clear sound, you can enjoy excellent music easily. Noise-cancelling & low-latency: This kind of headset works with stereo sound, and it is sensitive when operating it, not easy to make trouble for you. Functions: This headphone supports power display, calling and music playing, 0ing your hands and making your life more convenient, suitable for driving, sports, running, etc. Rechargeable: There is equipped with a charging cable that saves time for you to connect the headphone to your device, and it can be used for a long time after fully charged.