Multipoint connection: Two Point Connection Frequency domain: 2.402GHz-2.480GHz Frequency Response: 20Hz-20kHz Output Power: 28mW RL=16R, SNR(Signal to Noise Ratio):＞90dB Transmit Range: Up to 10m/33ft THD ( total harmonic distortion ): <0.1% Transmit and receiver cannot be used simultaneously Battery capacity: 3.7V/300mAh Micro USB Port for power supply(5V) Charging cable included RX operating time: 13 Hours TX operating time: 15 Hours Approximate charging time: 3 hours Dimension: L60xW60xH19 (mm)