Description Built-in lullabies help parents lull babies to sleep. Transmission frequency: ISM 2400-2483.5 MHz. Transmission distance: within 160 ft/50 m, outside line of sight 830 ft/260 m. LCD Screen Size: 3.5 inch. Resolution: 1080 * 720P pixels. Memory card support: 4-32GB. Battery: Lithium Polymer/1500mAh. Camera angle: 60. The parent unit has a battery inside. It works on battery or power charger. There is no battery built in the camera. So the camera always need to be plugged in the power outlet when it is working. Specifications Hign-concerned Chemical None Feature Multiple Receiver,Intercom,Baby Cry Alarm,Feeding Time Reminder,Temperature Monitoring,LCD Display,Power Saver,Portable,Music Display Resolution 480*320P Frequency(GHz) 2.4Ghz Number Of Channels 2 Storage Capacity 32GB Model Number ABM600 Size 3.5inch Battery Capacity 2000mAh Power Rechargeable battery Display Screen Size 3.5inch Display Type COLOR Lens Type CMOS Type Video Audio Connection Type WireLess Infrared Yes Video Resolution SD 720P Brand Name Cdycam Origin Mainland China Certification CE,FCC