Feature: 1. [Multifunctional] Bone conduction headphone with MP3, Bluetooth dual mode, built in 16G large capacity memory, replace songs at will, support volume and breakpoint memory, sports without wearing a cell phone. 2. [Clear Sound] This bone conduction wireless headphone with new linear vibration unit design, small constant linear vibration can achieve clear and powerful and highly resolved sound transmission. 3. [Stable And Long Battery Life] Bluetooth 5.3 sports headphone, premium chip, stable and clear sound. Built in 180mAh rechargeable lithium ion battery, can work for more than 6 hours, charging time is only 2 hours. 4. [IP68 Waterproof] IP68 level full sweat waterproof headset, suitable for training, fitness and running. Guards against sweat, water drops and dust during your indoor or outdoor activities. 5. [Lightweight And Durable] Open ear wireless headset weigh 25g/0.9oz, painless and harmless to wear. Premium titanium alloy material, any bending stretching without deformation. 6. [Ergonomic Design] Open ear sports headphone with ergonomic surround sound and streamlined sunken design, whether running, dancing or wearing glasses, it will fit your ears. Specification: Item Type: Bone Conduction BT Headphone Material: Titanium Alloy, ABS Model: X6 BT Version: V5.3 Protocol: A2DP, AVRCP, HSP, HFP Decoding: MP3, APE, FLAC Sound Channel: Bilateral Stereo Built in Memory: 16G Input Voltage: DC 5V Calling: -42dB Waterproof Level: Full Waterproof Design IP68 Playback Time: 6H (70% Volume in BT Mode) Battery Type: 180mAh Lithium Ion Battery (Built in). Package List: 1 x Bone Conduction BT Headphone1 x Magnetic Charging Cable1 x Instruction Manual