1、2.4GHz digital wireless transmission. The transmission signal is stable, with up to 250M Open space transmission. 2、Built-in MIC and speakers for two-way audio monitoring. Both the receiver and the camera have built-in microphones and speakers. 3、High sensitivity, is easy to hear the cry. And the lights will be turned on to inform parents. 4、Keep the transmitter approximately 1.5~2.0m far from the baby. Easy to pair, plug and play. 5、Both 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. 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: white 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: 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.