Features:
> 1/4" Sharp CCD image sensor
> 420 TV line with high quality image
> 15m(50ft) infra-red night vision
> Alloyed shell, vandal-proof structure
> Weather-proof for outdoor installation
> Built-in microphone for audio monitoring
> 4 channels switchable to avoid interference
> Easy setup, just connect to your TV or VCR.
> No wiring needed, DIY installation in 5 minutes
> Transmission distance up to 100m(330ft) in open space