V30 Wireless Audio Baby Monitor Support Voice Monitoring + Intercom + Night Light without Battery, Plug Type:US Plug Features 1. Adopt frequency hopping spread spectrum(FHSS),Anti-interference and sound clarity 2. Work Frequency Band: 900MHZ ISM,905—925MHZ 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： 0°C-50°C Parts list: - Parents machine x1 - Childrens machine x1 - Charger x1 - Instructions x1