The TX26-M1 by CDVI is a single-channel mains supply radio transmitter. It transmits up to 25 seconds over a distance up to 200 metres.
This discreet transmitter emits a radio frequency signal when powered, and continues for the duration of the supply up to 25 seconds. At the end of this period, the signal terminates. A new transmission will not be made until the transmitter is powered again.