12.4GHz digital wireless transmission. The transmission signal is stable, with up to 250M Open space transmission. 2Built-in MIC and speakers for two-way o monitoring. Both the receiver and the camera have built-in microphones and speakers. 3High sensitivity, is easy to hear the cry. And the lights will be turned on to inform parents. 4Keep the transmitter approximately 1.5~2.0m far from the baby. Easy to pair, plug and play. 5Both the parent unit and the infant unit can be powered by a DC 5V or 3 * 1.5V AAA battery.Features: 2.4GHz digital wireless transmission. The transmission signal is stable, with up to 250M Open space transmission.Built-in MIC and speakers for two-way o monitoring. Both the receiver and the camera have built-in microphones and speakers.High sensitivity, is easy to hear the cry. And the lights will be turned on to inform parents.Keep the transmitter approximately 1.5~2.0m far from the baby. Easy to pair, plug and play.Both the parent unit and the infant unit can be powered by a DC 5V or 3 * 1.5V AAA battery.Customized volume adjustment, two-way intercom, support for data encryption.Specifications: Material: ABS plastic Color: whiteVoltage:110~240vPlug Type:US Plug,UK Plug, AUPlug(optional)Baby Machine Transmission Frequency: Ism 2400~2483MHz Transmission Power: 17dBm Modulation Type: FSK Power: DC5V Power Consumption: 70mA Battery: 3 AAA batteries Operating Temperature: -10 ~ +60 Storage Temperature: -40~+ 70 Parent Machine Transmission Frequency: Ism 2400-2483MHz Transmission Power: 17dBm Receiver Sonsitivity: -85dbm Modulation Type: FSK Power: DC5V Battery: 3 AAA batteries Power Consumption: Poma Operating Temperature Range: -10 ~ +60 Storage Temperature: -40~+ 70 Package Included: 1 * Baby Unit 1 * Parent Unit 2 * Adapter 1 * Instruction Notes: 1.If it will not be used for a long time, please remove the battery or the power plug.