The Ooze Panther Black Slim Twist Vaporizer Battery is a discreet and powerful vape pen battery that is compatible with virtually all pre-filled oil, extract, essential oil, and delta 8 cartridges. The matte black finish is sleek and discreet; fly under the radar with a subtle device that doesn't draw attention to what you're doing.The Slim Twist Pen features a dial on the bottom that twists to select a precise voltage between 3.3-4.8V. Press the button down to take a hit, and the battery will shut off after 15 seconds of inhaling to protect against overheating.