Description:With excellent IPX8 grade waterproof performance, this earphone can still keep normal operation under the water.Featuring bone conduction design, this earphone can efficiently reduce the harm to eardrum and bring you comfortable wearing experience.Using high-quality ABS material, this product is lightweight and durable to use.The length of this product is 15.8cm, the width is 10cm, and the height is 3.5cm.It is suitable for swimming, diving, running, sports, fitness, etc. This earphone is also a nice MP3 player, and you need not to buy extra TF card because it has 32G large memory space for you to store thousands of music. In addition, the opening design of the earphone enables you to pay attention to surrounding voice while listening to music, which can efficiently ensure your safety.Item Name: Bone Conduction HeadphoneMaterial: ABSModel: B21Color: BlackBluetooth-compatible Version: 5.0Transmission Distance: 10m (Barrier Free)Bluetooth-compatible Chip: ATS2825CSupported Protocols: A2DP V1.3, AVRCP V1.5, HFP V1.6, HSP V1.2Audio Format: WMA, FLAC, MP3Operating Frequency: 20Hz-20khzBattery Capacity: Built-in 200mAh Rechargeable Battery (Included)Standby Time: 120 HoursCharging Time: 1.5 HoursMusic Time: 8 HoursTalk Time: 10 HoursWaterproof Grade: IPX8 Charging Interface: Magnetic SuctionEarphone Type: Bone ConductionMemory: 32 GBFeatures: IPX8 Waterproof, HiFi Sound, Bone ConductionSize 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 Cable1 x User Manual