Description: Using ergonomic, lightweight, open ear and bone conduction design, it is firm and comfortable for you to wear without falling off. The magnetic charging and multifunctional key are convenient for you to charge and operate it. With 16G memory, it can store more than 4000 lossless music without card and mobile phone. It is made of high-quality ABS material, which is solid and durable. The adjustable strap is made of food grade silicone material, which can adjust the wearing size and is suitable for different people. The length of the product is 15.8cm, the width is 10cm and the height is 3.5cm. It is suitable for bike-riding, motorcycle, driving and running. It can still be played normally within 5 meters of water depth. It has lossless sound quality, double noise reduction and HD-compatible call. It has HiFi sound quality, passive noise reduction, true wireless stereo, waterproof and dustproof functions. Item Name: Bone Conduction Headphone Material: Silicone,ABS Model: K8 Bluetooth-compatible Version: 5.0 Transmission Distance: 10m (Barrier Free) Battery Capacity: 350mAh (Included) Charging Time: 2 Hours Music/Talk Time: 12 Hours Frequency Response Range: 20Hz-20kHz Waterproof Grade: IPX8 Supported Music Formats: MA3, WMA, WAV, APE, FLAC Features: Bone Conduction, Magnetic Charging, Noise Reduction Size Details: 15.8cm x 10cm x 3.5cm/6.22” x 3.94” x 1.38” (Approx.) Notes: Due to the light and screen setting difference, the item’s color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Bone Conduction Headphone 1 x Charging Cable 1 x User Manual