The targets are items that you would typically find in a saloon but are actually fixed to the table/counter/etc. to allow for electricity connection. They feature a bullseye-like target with a sensor in the middle that detects when the pistol's beam hits it.
The light-up version of the targets uses a light at the top of each target to indicate whether it is still live or not. To reset a target or a game, the room simply has to re-light the targets.