Specifications: Transmitter Frequency range: 780-805MHz Transmit power:? 10dBm Operating current: 80mA±10mA Operating range: 50m Receiver Power supply: 2 AA batteries (not included) Operating current: 50mA±20mA S/N Ratio: >50dB Sensitivity: S/N 12dB 3uV Frequency response: 30Hz-18kHz Frequency range: 780-805MHz Stereo separation: >50dB Package size: 33 19 6cm / 13 7.5 2.4in Package weight: 588g / 1.3Lb Package List: 1/2/3/4/5/6 Receiver. (the quantity can be choosed by yourself). 1 Transmitter 1 Earphone 4 Rubber earplug 1 3.5mm to 6.3mm Plug 1 3.5mm to 6.3mm Conversion Cable 1 3.5mm to RCA Connecting Cable 1 Power Adapter 1 Manual Choose us, a good life begins!