Sherlo 1 button remote transmitters are commonly used for alarm systems. These remotes are best known for their great range of 100m plus.
 
Features
 
Encryption: Code-Hopping
Range: 500m (Open air)
Frequency: 403MHz
Voltage Range: 10V to 13V DC
Current draw: 32mA
Dimensions (lxbxh): 70mm x 37mm x 18mm
Gross Weight: 31 grams
Operating Temp: -3°C to 65°C
 
TX1