SVBONY Portable 3.5" TFT LCD Multifunction Security Tester Wristband CCTV Camera Color with LED Lighting for Surveillance Audio Video Input The handiest multifunctional cctv tester could help you install and test cctv cameras easily;test the view and angles of the camera;allow you test the cctv camera before installation Suitable 3.5" color lcd and clear screen with 320x240high resolution;high resolution provide more clear image;easy to identify;suit for any environment; support audio and video function Convenient wristband design;easily to tied to your arm or just loop the strap on the ladder for a hands free helper;could used in any place and any time Comes with durable rechargeable lithium battery;support power output DC12V/0.5A only to analog signal cameras;support 3 minutes non video automatic sleep function;it doesn't work with digital camera;such as 1080hd camera;cvi camera and so on Battery last long work time;helps you set up your cameras without running back and forth to the main monitor;great time saver