"Speedlight Remote Trigger, which cameras make use of to trigger speedlites consist of the transmitter and receiver, works by means of the FM wireless remote control.

Transmitter adopts advanced circuitry and components, as well as send FM Wireless signal. The circuit is designed with a standby sleep mode, so the power consumption is very low. I can be continuously triggered about 30,000 times on one new battery and uses a current of .01mA. Can be used on any digital camera with a hot shoe or traditional cameras with a PC jack. Highest synchronous speed is 1/250 secs.

The picture shows what is being sold, with operation booklet. I do not know what model this is.