Sentry 3 channel transmitter French Rolling code short range frequency @433.92 MHz, range up to 100 metres in clear line of sight.
French Rolling code dip switch coding (1,048,576 combinations, 28 bit)
Sentry 3 channel transmitter. (Unlimited number of transmitters can be used with each receiver, all transmitters must be set to the same dip switch code)
* Code Hopping transmitters & receivers are not compatible with French Rolling.