12.4GHz wireless digital transmission with stable transmission signal. 2Internal microphone and speak for twoway talk and audio monitoring. 3High sensitivity, allows baby's crying to be easily heard with light open to inform parents. 4Easy to be matched, plug and play. 5Supports data encryption and volume adjustment.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. Specification:Condition: 100% Brand NewMaterial: ABSColor: WhiteOptional Plug Type: US 100-240V, EU 100-240V, UK 100-240V, AU 100-240VPower Supply Voltage: DC 5VTransmission Frequency: Ism 2400-2483MHzTransmission Power: 17dBmModulation Type: FSKBaby Unit Power Consumption: 70mAParetn Unit Sensitivity: -85dbmBattery: 3*AAA(No.7) for each(Excluded)Working Temperature: -10~+60Storage Temperature: -40~+70Baby Unit Size: Appox. 62*40*103mm/2.4*1.6*4.1inParent Unit Size: Appox. 62*45*103mm/2.4*1.86*4.1inPackage Weight: Appox. 347g/12.2ozPackage List:1 * Baby Unit1 * Parent Unit1 * AC Adaptor for Baby Unit1 * AC Adaptor for Parent Unit1 * English User ManualNote: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 any danger.3. The chargeable battery can only be 1.2V AA NiMH battery, please do not charge the battery to avoid reducing battery life when not used for a long time.4. Please do not operate in high temperature and high magnetic field.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.