Eoncore Portable 4.3" Audio Video Security CCTV Camera Tester 12V Output RJ45 Cable Test Monitor Portable Product--Portable product is able to use in any place and any time. It is easy to hold and do not need complicated equipment that hinders the inspecting and repairing Monitor--4.3" high image resolution monitor enable to show clear image that fits any place to use Long Work Time--Equips with Lithium battery of high capability. Each 6hours recharge durables 5 8 working hours Humanized Design of Appearance--Hand-hold design for professionals. Easy operation without taking off gloves speeds your works. Clasp ring at bottom fits to all chains and use in all environments Support DC Power for Camera--It's convenient for user to check camera condition and correct direction of camera, so to make installation and repairing easier