Product model:DV900B  
1.Main features and parameters: 
?Camera or pan/tilt、zoom、iris、focus  controlling and camera parameters setting
?RS-485 communication, controlling up to 255 domes or cameras
?LCD display、3-axis joystick、DVR and alarm controlling
?Baud rate：2400/4800/9600/19200 Bits/S
?Transmitting distance：1200M（0.5MM twisted-pair cable）
?power supply：9-12VDC   5W
?Temperature： 0℃~+40℃
?Relative Humidity：<90%

2.Keyboard Installation:
Transportation and Storage:
?Be cautious to avoid rolling, collision and fall off in the transportation
?Keyboard should be stored in warehouse with good ventilation and without acid&alkali. The environment temperature should be–10℃~+40℃,the humidity should be below 90%.

Precautions:Do not dismantle the outer case, please consult to the repairman if there is any problem.
?Avoid keyboard working in the moist environment.
?The keyboard is a sensitive instrument, damages incurred due to acutely collision or shaking will void the warranty.