What's in the box:

eWeLink 433MHz Wireless Remote Controller with Keychain with Arm/Disarm/Home Arm/SOS 4 Buttons for Security Alarm System eWeLink RF 433Mhz Controlled Devices 1527 Chip Remote Control (Standard)

Note: It can work with Sonoff RF Bridge 433, 433MHz alarm host and other 433MHz devices.

Features:
*It has the button of arm, disarm, home defence and SOS, so you can operate remotely.
*4 buttons to operate 4 different garage doors, electronic rolling gates or retractable doors with RF 433MHz.
*Latest modern design and technology, which is equal to a simply smarter and unique remote.
*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.
*Compact design with key-chain, easy to carry and keep.
*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:
Transmission Frequency: 433MHz
Emission code protocol: 1527 protocol
Transmission Distance: 150m (open area)
Working voltage: 3V
Battery: Button Battery (included)
Emission current: 9-12mA
Transmitting power: 10-15mw
Static current: 0
Number of buttons: 4 button(Arm/Disarm/SOS/Home Defense)
Working environment: -10?-50? (14?-122?)
Relative humidity: 90%
Item Size: Approx. 6 * 3.7 * 1.1cm (L*W*H)
Item Weight: Approx. 17g / 0.6oz
Package Size: Approx. 9.5 * 3.8 * 2.8cm / 3.7 * 1.5 * 1.1in
Package Weight: Approx. 22g / 0.78oz

Package List:
1 * Wireless Remote Control