This is an infrared remote control wireless extender -- it allows you to use your TV remote from a different room (no line of sight).
Most devices in this class works by having an infrared receiver sitting in the room where you use the remote, transmit the signal wirelessly to an infrared transmitter sitting in the room where the TV (or other device, like a DVR) is.
What is unusual about this one is that it does NOT have an infrared receiver. The only interface it has with the remote control is a combination battery/transmitter that sits in your remote control (substitute as one battery).
I bought one and it actually works.
How does it know what infrared code is being transmitted by the remote, without an infrared receiver?
I can only think of two ways: (1) it monitors the fluctuation in the current drawn by the remote (2) it picks up the electro magnetic wave leaked from the remote
Either way, the signal it obtains are not designed to be used this way (probably full of noise) and needs to be processed to get the final infrared code.
Is this clever engineering or what?