Liveinsmart Technologies

The blaster itself is a combination of a receiving unit (which takes remote commands via wire or RF) and one or more infra-red-light emitters that relay those commands to the devices to be controlled. Often the receiver is a small unit that sits on or near those devices, which offers one or more jacks into which small IR emitter modules are plugged. Those emitters are then placed so that they can shine infra-red light on the IR sensors of the devices, either directly or bounced off a surface such as a cabinet door.If the remote control to be used is also IR-based, there must be an IR sensor within its line of sight that will relay signals to the IR blaster over a wire or radio.The output of an IR blaster (like that of any infra-red remote) is invisible to the human eye because its wavelength is beyond the range of visible light. The signal does not affect the human body and has no side effects for long exposure.