THIS IS A KIT CONTAINING ALL PARTS TO BUILD THIS UNIT. THIS UNIT DOES NOT COME ASSEMBLED. You will need a soldering iron and basic electronics knowledge. OD 4+ Laser Safety Goggles are required to operate this product. (520nm range) Requires 1x 21700 3.7v flat top, unprotected cell capable of 3A CONTINUOUS. (not included) Keep lens CLEAN! DO NOT BURN OBJECTS CLOSELY! This handheld can be kept on continuously. No reverse polarity protection. (INSERTING BATTERY BACKWARDS WILL DAMAGE DRIVER) Focusable 2E lens installed. Single mode driver. Aluminium body. Lifetime warranty