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.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: whiteBaby 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:2.Do not use an external power supply when using a normal AA battery.3.The rechargeable battery can only be a 1.2V AA NiMH battery. 4.Do not operate at high temperatures and high magnetic fields.5.Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering..