Headphone Driver Diameter 10mm Max. Input Power 15mW Sensitivity at 1kHz 108dB/1KHZ Impedance at 1kHz 32 Ohm Frequency Response 10HZ-20KHZ Microphone In-Line Mic Type MEMS In-Line Mic Sensitivity at 1kHz -42+/-3dB In-Line Mic Frequency Response 100HZ-10KHZ In-Line Mic Impedance <2.2K Ohm Battery Battery Type 120mAH Duration Maximum 8 hours Wireless Bluetooth 4.1 Range 10m In-Line Mic Frequency Response 100HZ-10KHZ The results depend on actual environment. Rapid Charging requires 1A/5V power connection, including cable and adaptor. Item Dimension (L"x W"x H") 8 x 5 x 3 Weight 1.00 LB Warranty Information 1 YEAR