Specification: Model Number: V30 Connection Type: Wireless 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 3pcs 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 Operating Temperature: 0°C-50°C Packing list:1 x Baby Unit, 1 x Parent Unit, 1 x AC adaptor for baby unit, 1 x AC adaptor for parent unit, 1 x English Manual (Batterise is not included) Main Features: *2.4GHz digital wireless transmission, stable transmission signal. *Built-in MIC and speaker for two-way audio monitoring. *High sensitivity, the crying voice is easy to be heard and the lamp will turn on to inform parents. *Easy pairing, plug and play in. *Position the transmitter at a distance of about 1.5-2.0 meters from the baby. *Both parent unit and baby unit can be powered by DC 5V or 3*1.5V AAA battery. *Volume adjustment *Two-way intercom, support for data encryption *Both the receiver have built-in microphones and speakers *Open space transmission range up to 250M