Features:
*Latest modern design and technology, which is equal to a simply smarter and unique remote.
*Button slide cover to protect buttons avoid accidental unplanned operation.
*You can still keep and use your original factory remotes as well as the additional one, if your original remotes allow multiple remote control encoding.
*Codes into your garage door in less than 30 seconds.
*Handy key chain size attaches to your car keys no more unwanted bulkiness.
*4 buttons to operate 4 different garage doors, electronic rolling gates or retractable doors with RF 433MHz.
*Work with other Sonoff RF 433Mhz controlled devices, such as Sonoff RF, Sonoff 4CH Pro, Sonoff T1 UK 1CH/2CH/3CH, Sonoff RF Bridge 433, etc.

Specifications:
Operating frequency: 433MHz
Encoding: fixed code (1527 Chip)
Power supply: 1* 12V 27A Batteries (included)
Efficient distance: 20M (in open area)
Material: Metal + Plastic
Button: 4
Panel: slide cover
Size: 5.5*3 *1.8cm
Package Information:
Package Size: Approx. 9.3*6.1*2cm/3.66*2.4*0.79in
Package Weight: Approx. 31g/1.09oz 
Packing List:
1 * Sonoff RF Remote Controller