Item Type: Earphone Material: ABS Bluetooth Version: V5.3 Transmission Distance: Approx. 10-20 meter / 32.8-65.6ft Horn: Approx. 16mm / 0.63in Impedance: 32 Charging Interface: Type C Using Time: 20 Hours Charging Duration: 1.5H Battery Type: 200mAh Lithium Ion Battery (built in) Package List 1 x Earphone 1 x Type C Charging Cable 1 x User Manual 1BONE CONDUCTION: Open ear bone conduction earphone, suitable for jogging, cycling, hiking, etc., providing the safest listening and playing music. 2GOOD PERFORMANCE: The earphone adopts V5.3 Bluetooth chip version, with stable signal, low standby power consumption, and better performance. 3EXCELLENT SOUND: Composite diaphragm and large dynamic acoustic technology to restore the high frequency brightness and fixed frequency richness of music. 4180 DEGREE ROTATION: Built in rotatable shaft, this wireless earphone supports 180 degree rotation, and is compatible with both left and right ears. 5BATTERY AND LED: This earphone has LED power display, allows for real time viewing of remaining power, built in 200mAh battery for long usage time.