General | Model | YS-M21W | Sensitivity | -34 +/- 3 dB | Frequency Range | 100-10,000 Hz | Impedance | less than or equal to 2.2 kiloohms | SPL | 115dB | Operation Voltage | 4.5V-5.5V | Battery Capacity | 2500mAh | Working Time | more than 8-10 hours | Interface | Mini USB | Cable Length | 3m | Size | 325x340x64mm | Weight | 715g | |