Pulsar M2 Thick Oil Cartridge Vape BatteryThe Pulsar M2 variable voltage battery 450mAh features a drop in screw in function, your cartridge will never fall out or lose a connection from a poor set of magnets. A 12 second pre heat, 450mAh battery & only 2. 5" tall, this unit will quickly become your new "go to unit" when hitting the trail or during those awkward family gatherings. NOTE: The M2 comes with everything you need except for a cartridge. Use cartridges with a diameter up to 10mm.