4.3 " HD-2900 8MP AHD/CVI/TVI CVBS Analog CCTV Security Camera Monitor Tester
(CCTV installers often need to carry a variety of testing tools to complete their work. ●CCTV system installation and maintenance. Model：HD CCTV tester. Battery：Built-in 3.7V Li-ion battery,5200mAh. 3) Li-ion battery (3.7V DC 5200mAh).