Bone Conduction Bluetooth Earphones This bone conduction blue tooth earphones with open ear design can keeping you connected and aware of your surroundings, perfect for running, hiking, workout, sports and driving etc. - Features: Adopt bone conduction technology which delivers premium audio through the cheekbone Ensuring painless and harmless as the earphone is no need to plug into the ear canal. IPX5 waterproof, resist sweat, moisture, water drops, and dust Support blue tooth 5.1 transmission, no delay, no lag Can support 6.5 hours of continuous music and or 2 hours phone calls on a single charge - Specifications: Material: ABS Bluetooth version: V5.1+EDR Wireless frequency: 2.4GHZ Supported protocols: A2DP1.3/HFP1.6/HSP1.2/AVRCP1.6/D11.3 Transmission distance: 20 meters Battery capacity: 180m - Ah Charging voltage/current: 5V/1A Play/talk time: about 12 hours Charging time: about 2 hours Standby time: 90 days Speaker impedance: 10mm 32 Microphone sensitivity: -42Db Working temperature: -10-50?? Package Contents: 1 x Bone Conduction Bluetooth Earphones 1 x Type-C Cable 1 x Instruction - Please Notes: 1,The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2,Please allow slight manual measurement deviation for the data.