... Monitor lift has 5 buttons, which are used for manual control (from left to right): Roration-BACK; Rotation-FRONT, Pause, ... UP, Lift-DOWN.2. Remote control3. RS232, RS485 controlYou can control the LCD monitor lifts working as individual, group or whole ... hole size 480×81mm N.W 25kg Control modes manual,remote,RS232 RS485 control Certification CE Advanced RS232 RS485 control 19" electric monitor lift