Features: 1. Code prevent to copied function. Receiver capacity of 2000 transmitters code. 2. One button to control receiver. (Four button of transmitter control four control panel) 3. Set time max to 127 seconds to down function. 4. Safety function: the rolling door will stop opening upon detecting on obstruction. 5. Built-in burglar alarm contact point. 6. Minimal heats dissipation even under prolonged operation. 7. Detect current. 8. Normal operation is maintained under cold weather or upon prolonged operation. Sensitivity of obstruction detection mechanism is also maintained. OPTIONAL PURCHASE - UPS ( buil-in UPS contact point and continue 150 hours) - lamp - traffic light control board - indoor lamp control board Specification: - Voltage: AC110/220V - Frequency: 433.92 MHz