This is a Jafin Light Load laser trainer for a .357 K Frame Smith And Wesson. Everything needed for this laser trainer to convert your pistol to a laser shooter is included.
The way that it works is a laser beam is fired at the included target rather than a live round.
It saves money normally spent on ammo.

2 type 1.5 v batteries needed. Mot included.

If you have questions pkease ask.