The discreet battery that changes everything! The Tanker 510 Thread Thermal Chamber Vaporizer Battery will be the new way to smoke cartridges. This Ooze unit is a 650mAh adjustable voltage battery with 4 different voltage options. You read that right, 4! It is recommended to start on the lowest voltage level when testing out a new cartridge. You thought we were one explaining this, well, you are wrong. Let us dig deeper, shall we? The Tanker is made out of heavy-duty material that protects your cartridges and is the new discrete way of smoking. It is equipped with a thermal chamber that acts as a barrier around the cartridge and encloses the oil in the cartridge, which improves airflow. To begin preheat mode, you will have to press the button 2 times and the unit will heat at a low voltage for a15 seconds straight, no button pressing is required. The Tanker is described exactly how it sounds, strong and sturdy. The worries end here with this device. Your cartridge will always be protected if it falls. Also, included is a Micro USB.   Feel Protected with the Tanker!  TANKER | The Ooze Tanker is a robust and potent 510 thread vaporizer designed for oil cartridges and wax attachments. This 650 mAh device offers impressive battery longevity. CARTRIDGE PROTECTION | The Tanker features a thermal chamber that acts as a protective shield for your cartridge, safeguarding it from accidental drops or falls. It also prevents your cartridge from cracking while in your bag. THERMAL CHAMBER | This thermal chamber serves a dual purpose by enhancing airflow, particularly in colder conditions. It gently warms the chamber's interior, maintaining the oil's consistency at an ideal level for vaporization. FLEX TEMP | The Tanker provides four voltage settings. Simply click the button three times to switch between levels, and a distinct LED light will illuminate, indicating the selected temperature.User Manual