Model ZM-HPS700W Weight 290g Dimension 197 x 91 x 188mm Color Black Headphone Driver Diameter 50mm Headphone Impedance 32ohm±15% Headphone Frequency Responce 20Hz-20KHz Headphone Sensitivity (SPL) 100dB±3dB Wireless Version 2.4GHz ISM Wireless Transmitting Power 7dBm Wireless Receive Sensitivity -82dbm Wireless Transmit Distance 10m Mic Directivity Omnidirectional Mic Impedance 2.2K ohms Mic Sensitivity -42±3dBV Mic Connector Type ø 3.5mm Virtual 7.1 ChipSet Included Headset Usage Time Max.12H Headset Charge Time 2.5H (5V 500mA) Battery Capacity 1000mAH Max Output Power 20mW