Infrared flasher is divided into two different devices (2 of 1): trigger and receiver. The transmitter must be in the line of sight before it can be used (that is, the receiver can see the transmitter directly, otherwise it can't flash. In addition, there must be no obstacles between the transmitter and the receiver). Infrared flasher is greatly influenced by sunlight, in this case, the use range of flasher will be shortened.
The premise of using this flasher is that the flasher must have its own infrared device. Many models of flashlights, including Canon and Nikon, have infrared devices.