Features: 1. Anti-copy rolling code. Get the patent for unique digit code. 2. High Steady: Won't change the sensitive by weather or temperature. 3. Anti-obstruction: Two closer receivers wont affect by each other. Totally fit with the safety rules. 4. Long distance transmitting: about 300 meter in wide space. 5. As you slide the case you could find three switch inside. One for the function power off by pressing OFF button on the transmitter, one for add new transmitter or delete past memory. The last one is for reversing the direction UP and DOWN. Technical Data: (1)Receiver specification: * Dimension: 10.5 x 9 x 3.5 cm * Voltage range: AC100V/60Hz~AC260V/60Hz * Stand-by power: AC110V(1.2W)AC220V(2.4W) * Working temperature: -20°C~+45°C * Memory capacity: 2000 pieces transmitter (2)Transmitter specification: * Supply power: DC12V (GP27A) Battery * Stand-by power: 1.5uA * Transmitting power: about 10mA * Frequency: 433.92MHz