SPECIFICATIONS

Battery Capacity(mAh): 2000mAh
Brand Name: Cdycam
Certification: CE,FCC
Choice: yes
Communication Interface: WireLess
Display Resolution: 480*320P
Display Screen Size: 3.5inch
Display Type: COLOR
Feature: Multiple Receiver,Intercom,Baby Cry Alarm,Feeding Time Reminder,Temperature Monitoring,LCD Display,Power Saver,Portable,Music
Frequency Range: 2.4Ghz
High-concerned chemical: None
Infrared: Yes
Lens Type: CMOS
Model Number: ABM600
Number Of Channels: 2
Origin: Mainland China
Power (W): Rechargeable battery
Size: 3.5inch
Storage Capacity: 32 GB
Type: Video & Audio
Video Resolution: SD 720P

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 .