Wireless Headphone (P39) With Built-in mic Rechargeable Surround Bass HD Microphone Comfortable/Compatible With All Wireless/Wired Devices (Green Humanized design and super soft ear cushions, ensure maximum wearing comfort. 3D HD stereo sound, powered by professional BASS amplifier chip to provide powerful bass sound Excellent tone quality, also can play with TF card. Talk time: about 10 hours, Battery specifications: 400mAH, Charging time: about 1 hour, Standby time: 180 hours Working distance: 10m