Description 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 audio 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 audio 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 plasticColor: white Voltage:110~240v Plug Type:US Plug,UK Plug, AUPlug(optional) Baby MachineTransmission Frequency: Ism 2400~2483MHzTransmission Power: 17dBmModulation Type: FSKPower: DC5VPower Consumption: 70mABattery: 3 AAA batteriesOperating Temperature: -10 ~ +60Storage Temperature: -40~+ 70Parent MachineTransmission Frequency: Ism 2400-2483MHzTransmission Power: 17dBmReceiver Sonsitivity: -85dbmModulation Type: FSKPower: DC5VBattery: 3 AAA batteriesPower Consumption: PomaOperating Temperature Range: -10 ~ +60Storage Temperature: -40~+ 70Package Included:1 * Baby Unit1 * Parent Unit2 * Adapter1 * InstructionNotes:1.If it will not be used for a long time, please remove the battery or the power plug.sp