A TCL Smart Projector with an Android TV system comes with a Bluetooth remote control, and you need to pair the remote control with the projector before you can use the remote.
When you turn on your projector for the first time, you'll see a page titled "Pair Your Remote Control" Just follow the on-screen instructions to pair your remote with the projector. We've also listed the steps below:
Hold the remote near your TCL Smart Projector.
On the remote, press the HOME and BACK - keys together for about 3 seconds, then release.
Your remote control will now be paired with your TCL Smart Projector.