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. Supports data encryption and volume adjustment. Open space transmission range up to 250M. Specification: Condition: 100% Brand New Material: ABS Color: White Transmission Frequency: Ism 2400-2483MHz Transmission Power: 17dBm Modulation Type: FSK Baby Unit Power Consumption: 70mA Paretn Unit Sensitivity: -85dbm Battery: 3*AAA(No.7) for each( Excluded ) Working Temperature: -10°~+60° Storage Temperature: -40°~+70° 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 Package Weight: Appox. 347g/12.2oz Package List: 1 * Baby Unit 1 * Parent Unit 1 * AC Adaptor for Baby Unit 1 * AC Adaptor for Parent Unit 1 * English User Manual 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 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.