This petite battery is no bigger than your average lighter, shaped in the form of a car key and making it the perfect portable device. Made specifically to be compatible with any 510 thread oil cartridges, this battery employs three different temperature settings for precise performance. It now has a longer lifespan for the new upgraded PCB and battery cell as well as long last powerful 350mAh battery. It also employs a power output of 2.7V to 3.6V, an integrated USB charging cable and a loop for attaching to keychain. With 5 clicks of the power button, the battery is turned on or off and can be charged simply by the side USB port. The Lokey 2 24K Gold Edition Key Box Battery can be fully charged within 4 hours and will hold a charge through multiple sessions. With everything you could need and want out of a device, the Lokey 2 24K Gold Edition Key Box Battery is your go to for on the go vaping. Get one today!