You can connect an external speaker to it via Bluetooth or an Aux cable. Just follow the instructions below:

Connect via Bluetooth:

1. Turn on the projector and external Bluetooth speaker.
2. Make sure the speaker is in Bluetooth pairing mode.
3. Go to "Settings > Remotes & Accessories > Pair accessories" to connect the TCL SmartProjector to your external speaker via Bluetooth.

Connect via an Aux cable:

1. Turn on the projector and external speaker.
2. Use an aux cable to connect via the projector's aux port, and the aux port on your speaker.