This is the older style with the barrel clamp / rail clamp and pressure tape switch. Batteries included, works well and mounts to darn near anything you can put it on. Moving to LED system, mainly sat on gun in safe. Bargain next to all those new $500 set ups out there. $175 shipped obo e-mail notifications don't seem to be working so if you don't e-mail me direct it may take a bit to get back to you. Thanks!