The Ooze 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. An Ooze pen is the perfect finishing touch to any outfit. 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. Activate preheat mode by clicking the button twice and the battery will heat for 15 seconds without needing to press the button down. This is a 320 mAh device that includes an Ooze smart USB charger with built-in overcharge protection. The charger automatically shuts off as soon as the battery reaches a full charge, greatly extending the overall life of the battery. FEATURES Ooze 320 mAh Battery Preheat mode Adjustable Voltage: 3.3V - 4.8V 15 Seconds Hold Time Fits all 510 Thread USB Smart Charger Smart USB Rapid Charge Auto Safety Shut off Preserves Battery Cells