Type: corded wireless headphones 400mA battery Unit of Driver: 40 mm Functions include MIC operation, play device, pause, and volume control. Time stalled: 100 hours It uses a 40mm HiFi dynamic coil speaker that has high fidelity, high dynamic sensitivity, and other features. Enjoy the high-pitched, clear, and thick bass of professional-grade music with support for AAC/SBC advanced audio decoding mode. 18 hours of play time Regularity Reaction: 20 Hz–20 KHz Length of cord: 1. 2 m = 10% 3. 5 mm stereo plug as a connector Attenuity: 114 dab/mW Source of audio: communication devices