Bluetooth stereo headphones sports waterproof and noise reduction wireless head wearing double ear rear mounted stereo ear plugTransmission range: 5 metersFunctions: call function, voice control, music support, multi-point connectionBluetooth protocol: 4.1Channel: stereoUsage: ear typeCharging mode: power adapter output (DC5V 300mA)Standby time: about 10 daysBattery capacity: 210 mAContinuous call duration: about 6 hoursContinuous playback time: about 8 hoursSupport: Hands Free 1.6 - Headset 1.1 - A2DP 1.2 - AVRCP 1.5 - SPP 1.0 built-in DSP, high quality audio processing. Support SBC/AAC_ LC audio decoding formatFeatures: Bone conduction exercise earphones do not need to listen to music, and do not damage the eardrum. They can also hear outside sounds while listening to music while driving, cycling and sports, so as to avoid accidents.