This mac built cut down black mag runs a p4 seoul using a C li-ion cell. The driver has multiple modes which include hi, low, wave, beacon, and others. I received it in a trade, but lack the c cell to run it. I tested it with an 18650, and it works fine. This light has macs clicky tailcap, and it is shorter than a mini mag! It also has glow around the emitter. This light is awesome, but it's time to move on has come. First I'll take it gets it, $175, now $155 shipped conus. Thanks for looking!