Features: Easy operation. 4 channels, small size, lightweight and portable. 2 types, 315MHz/433MHz for you to choose, you can select according to your needs. The device has decent transmission distance and is quite flexible in functionality, signal stability. Mainly used in garage door control, lighting control, electric door, remote control curtains, lifting equipment, motor control, water pump, projection screen elevator control and security industry and other fields, safe and reliable. Specifications: Material: ABS PCB Board Size: Approx. 9.2x6.5 for cm/3.62x2.56 in Type: 315mhz/433mhz RF frequency:315MHz/433MHz Package Includes: 1 Set Remote Control note: Learning methods and steps: 1, press the receiver to learn the for key - light, said into the learning state 2, press the remote control any for key - light slowly flash three, said the study has been successful. Clear the saved information Long press the receiver to learn the button until the LED lights flash five times after the extinguished, that the information has been successfully cleared