The Pulsar ReMEDi Evod Variable Voltage Battery offers 3 color coded voltage settings: Red / 4.0V, purple / 3.7V, Blue / 3.4V. Click 5x to turn on, click 3x to change voltage, click 1x to use. Works with the ReMEDi oil tanks, ReMEDi 1mL thick oil tank, and ReMEDi .5mL thick oil tank. The variable voltage settings allows your customers to choose which setting is optimal for the thick oils they are using. These vape batteries are easy to charge with a built-in micro USB charging port on the side (chargers sold separately). Covered by a 6 month end user warranty.