1) 1-channel video input and output 2) 2.5" LCD tester box, OSD 3) CE/ ... in one small and exquisite appearance.2) 2.5" LCD display, and show camera image 1-channel video input, ... KALATEL, SAE etc.7) Control the PTZ and camera.8) External charging, factory configuration charger, two rechargeable ... time and effort. ModelBT-B300Shell Color LCD screen2.5 inch LCD displayInput voltageDC9V,2ABattery2 x DC3.6V ...