Specification: - Input power: AC110/220/230V - Frequency: 433.92MHz - Memory capacity of receiver: 2000 transmitters Feature: - One button recycle mode There are 4 buttons that are open, stop, close, off (lock) in a transmitter. User can choose it to control one door or reset 4 buttons to control 4 different doors. The action mode is open, stop, close, stop and it will recycle with every of your press. We also have another transmitter which can control max 8 doors. - Protection function The door touching obstructions will up to limit location while it is closing. When the door is opening, it meets obstructions will stop. - Manual switch We provide a connect point that user can connect with their manual switch. There is also a manual switch on the plastic case. User can directly press the buttons to control. - Set time to down automatically (Time range is from 5~127seconds.) Users can set time by themselves to let the door automatically close. - Random detect current function This is the most different feature between another brands. Control box changes the resistance by detecting the current. So the sensitivity won¡¦t be declined or affected by weather or surrounding. - Burglar alarm Provide connect point to add burglar alarm system. While the roller door meets the irregular opening, the alarm will beep automatically. - UPS (optional purchase) Built-in UPS contact point and user can buy UPS to prevent electric service interruption. - Traffic light control board (optional purchase) Built-in contact point connects with traffic light PCB for packing space. - Optional add infrared sensor to detect obstruction User can choose install sensor to detect obstruction before touching it.