Main Features: >Digital wireless kits >Super image quality with vivid pictures >Stable signals,anti-interference technology >Transmission distance in open area: 200 meters >Two way speak for camera and its matched receiver >Built-in Li battery works for 2-3hours continuously   Main Parameters: Item Value Receiving Frequency 2.400GHz~2.480GHz Method of regulation FSK Working Temperature -20~60/ -10~50 Definition (dot) 480mm((W) x 240mm((H) CAMERA TV System PAL NTSC Valid pixel 628(H) x 582(V) 510(H) x 492(V) Image Device 1/4 CMOS Image sensor Horizontal Definition 380TV Line Transmission Signal Video, Audi Minimum Illumination 3Lux/F1.2 Scan Frequency PAL/CCIR: 50Hz NTSC/EIA: 60Hz Open Transmission Distance 200M Power DC5V/800mAh Transmission Power 17dBm Transmission Frequency CH1:2.414GHz CH2:2.432GHz CH3:2.450GHz CH4:2.468GHz RECEIVER Sensitivity -85dBm LCD 2.4'' TFT LCD Power off at low voltage Power off automatically when voltage is lower than 3.3V Power DC5V/1.5A Size 123 x 72 x 24mm Weight 200g Receiving Signal: Video, Audio Battery Build-in 3.7V/350mAh lithium battery Power Consumption 1W