Note: 1. Please remove the battery or power plugs when it's not used for a long time.2. Please do not use any external power supply while using ordinary AA batteries in case of danger.3. Please do not operate in high temperature and high magnetic field. Features 2.4GHz wireless digital transmission with stable transmission signal. Internal microphone and speak for two-way talk and audio monitoring. High sensitivity, allows baby's crying to be easily heard with light open to inform parents. Easy to be matched, plug and play. Supports data encryption and volume adjustment. Open space transmission range up to 250M. Material: ABS Power Supply Voltage: DC 5V Transmission Frequency: Ism 2400-2483MHz Transmission Power: 17dBm Modulation Type: FSK Baby Unit Power Consumption: 70mA Paretn Unit Sensitivity: -85dbm Baby Unit Size: Appox. 62*40*103mm/2.4*1.6*4.1in Parent Unit Size: Appox. 62*45*103mm/2.4*1.86*4.1in Safe and stable transmission 2.4GHz wireless digital transmission with stable transmission signal, open space transmission range up to 250M. The transmitted data is encrypted to ensure that privacy is not leaked.