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. Widely application, can be used for garage door, electric door, house door, shutter door, expansion door, etc. Specifications: Material: ABS Size: Approx. 5.8x3 for cm/2.28x1.18 in Type: 315mhz/433mhz RF frequency:315MHz/433MHz Note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1 Set Remote Control