Wireless Audio Baby Monitor, Plug Type:US Plug Features 1. Adopt frequency hopping spread spectrum(FHSS),Anti-interference and sound clarity 2. Work Frequency Band: 900MHZ ISM,905925MHZ 3. Long distance transmission 200-300 meters in the open field 4. Transmitter and Receiver need making pairing code before any opperation, Confidentiality is strong 5. With 2-way talk, music and nightlight function 6. When there is without any sound from Transmitter within 20 seconds,the receiver will be in mute state 7. This product does not have a battery Parameters 1. Operating frequency ISM 905-925MHz 2. Transmission power 10 dBm 3. Modulation mode FSK 4. Spread spectrum method FHHS 5. Audio encoding ADPCM 6. Modulation frequency 180 KHz 7. Code rate: 500 Kbps 8. Receiver sensitivity 92 dBm 9. Power supply mode 5V USB or 3pcs AA dry battery 10. Transmitter operating current 180 mA MAX (all open) 11. Transmitter standby current 75 mA MAX 12. Receiver operating current 75 mA MAX 13. Battery specifications 3pcs 1.2V AA dry battery 14. Operating Temperature 0C-50C Parts list: - Parents machine x1 - Children's machine x1 - Charger x1 - Instructions x1