then to the auditory nerve. It avoids the occurrence of ear damage and hearing loss, giving your healthy listening. IPX8 waterproof and light-weight design immerse you in sports and music, suitable for walking, hiking, running, climbing, skating, driving, and other activities. With 8GB independent memory, it supports MP3 playback mode, and can also switch to BT playback mode. MP3 Playing Mode:  Built-in 8GB memory capacity, you can download the music you like to this headphone via data transfer cable and able to enjoy music through MP3 play mode. BT 5.0 Connection: BT 5.0 ensures high data transfer speed, stable connection, and low power consumption. Free to enjoy hands-free calls or BT music via BT connection. Born for Sports: IPX8 waterproof and 36g light-weight design immerse you in sports and music, suitable for swimming, walking, hiking, running, climbing, skating, driving, etc. Long Battery Life: 230mAh rechargeable Lithium battery provides about 6 hours of playback time (at 65% volume) on one full charge and the standby time can last to 10 days. Specifications: Model Number: X18 Pro BT: V5.0 BT Profile: A2DP, HFP, HSP, AVRCP Operation range: Up to 10 meters (no obstacle) Frequency Range: 20-20KHz Receiving Sensitivity: 89±3dB Battery Capacity: 230mAh Music Playing Time: up to 6 hours (depends on music volume) Standby Time: about 10 days Charging Time: about 2 hours Music Format: MP3, WMA, WAV, APE, FLAC Color: Black, White, Red, Blue (Optional) Main Item Size: Approx. 14.3*10.3*4.6cm/5.63*4.05*1.81in Main Item Weight: Approx. 36g/1.27oz Package Size: Approx. 16.8*12.0*5.3cm/6.61*4.72*2.08in Package Weight: Approx. 188g/6.63oz Package List:    1 * Bone Conduction Headphone 1 * Charging Cable 1 * User Manual (English/Chinese)