Camera can output the audio and video signal synchronously. Open transmission distance 100M. 2.4G locked frequency transimitter and receiver. The battery of camera, which works continuously for about 1 hour is 9V. The camera could be suitable in the special environment. 2.5 inch LCD screen display the picture, TV system PAL/NTSC automatically switch. Can receive the wired audio and video signal. After AA lithium refreshed batteries, it could work continuously for above 2 hours.