Receiver Bluetooth 4.2 with apt-X, standalone DAC, compatible with Android and iOS, volume and playback control, built-in microphone, metal body, range up to 10m, durability approx. 8h, output power> 30mW (16? / THD <1%) , frequency range 20-20,000 Hz, recommended headphone impedance 16-100Ohm, THD + N <0.04% (1kHz), signal / noise ratio> 95dB