Bluetooth headphones 200mA battery Unit of Driver: 40mm Functions: MIC function, pause/play device, and volume control Play time: 18 hours; steady by time: 100 hours Regularity Reaction: 20 Hz–20 KHz Length of cord: 1. 2 m 10% 3. 5 mm stereo plug as a connector Attenuation: 114 dab/mW