Overview:FX P36 3W LED Flashlight 1X16340 Black Battery Configurations:1 x 18650 rechargeable Ii-on battery (not included) Voltage Input:2.8~4.2, 4.2V max Switch Type: Clicky (Clickie) Switch Location: Tailcap (Tail-cap) Specification: Weight Approx:51.7g Size Approx:9 x 2.5 x 2.5