Features: -Adopt frequency hopping spread spectrum(FHSS),Anti-interference and sound clarity. -Work Frequency Band: 900MHZ ISM,905—925MHZ. -Long distance transmission 200-300 meters in the open field. -Transmitter and Receiver need making pairing code before any operation, Confidentiality is strong. -With 2-way talk, music and nightlight function. -When there is without any sound from Transmitter within 20 seconds,the receiver will be in mute state. Specification: Operating frequency: ISM 905-925MHz. Transmission power: 10 dBm. Modulation mode: FSK. Spread spectrum method: FHHS. Audio encoding: ADPCM. Modulation frequency: 180 KHz. Code rate: 500 Kbps. Receiver sensitivity: ≦-92 dBm. Power supply mode: 5V USB or 3pc AA dry battery. Transmitter operating current: 180 mA MAX (all open). Transmitter standby current: 75 mA MAX. Receiver operating current: 75 mA MAX. Battery specifications: 3pcs 1.2V AA dry battery (Battery not included). Operating Temperature: 0°C-50°C. Color: White. Plug: EU/US/UK/US plug. Package included: 1 x Wireless Audio Baby Monitor. 1 x Adapter