CCTV Wrist Tester Monitor 3.5 Inch Professional Grade BNC In Out LCD Screen PTZ Control OSD 320x240 Resolution RS485 Communication; Video test function; 3.5 in high resolution LCD screen; PTZ control and test function; Output DC 12V; Video generating function; Support more than 20 kinds of RS 485 Protocol; Built-in speakers to test audio; Multi-language menu; Control 255 high speed domes; Battery power status display; Powered by adapter on rechargeable battery; One full charge means 10 hours of working time;