HARGER's DRONE Ultraweld UltraShot drone controller utilizes a Milwaukee M18 REDLITHIUMTM XC 4.0 18 V battery featuring a built-in fuel gauge. Makes over 1,300 connections on a single charge! The UltraBright LED indicates instantaneous ignition. Borrowing from Harger's previous model, the dual trigger ignition design adds safety measures with no accidental bumping or misfires. Also includes a 6 ft cord featuring a quick latch disconnect which allows for easy storage. Safe, lightweight, handheld, instantaneous exothermic connections, Extended Battery Life! DRONE ignites UltraShot copper drop-in weld metal cartridges that are consumed in the exothermic connection.