This keyboard has various functions, Can control high speed dome camera, PTZ, digital video recorder, matix system, alarm equipment. Content: This keyboard has various functions, Can control high speed dome camera, PTZ, digital video recorder, matix system, alarm equipment. It can connect with 32 pieces slave keyboard. 24 by 2 LCD display module. English, Chinese Traditional/Simplify language support. This operator can direct control 1024 pieces high speed dome camera. Built in more than 10 kinds of digital video recorder control protocols, it can direct control many kind of DVR. Built-in Speed Dome protocols, support for more than 10 famous Speed Dome brands. No external protocol converter necessary. Built-in buzzer for error operation and event alert. 2D Joystick, 3D joystick, 64 ranks control speed rate. 2 layer user password protect with key lock function. Technical specification: Power Consumption: 10W Power supply: AC220V 50HZ+15%( standard) AC110V60HZ+15%(option) AC/DC 9V(option) Control port: RS485 x 1-3 Protocol: Dome, receiver No Support protocol 1 PELCO-P 2 PELCO-D 3 DIAMOND 4 MAXPOR 5 VCL 6 LILING 7 VIDEOTREC 8 FOREADY 9 PANASONIC 10 SAMSUNG 11 SANTACHI 12 LONGCOMITY