The Spin vaporizer pen offers a host of great features in an affordable package: Adjustable Voltage – The dial on the bottom of the pen allows you to adjust the voltage anywhere from 2.0 – 4.0 Volts. Charge Indicator – Know when your battery is running low before it’s out with the battery power indication light. Flex Connect™ – This connection system reduces issues with ground outs and sticky carts pulling the pen apart when removed. 400mAh Battery Preheat Mode Comes in Black, White, Mint, Gold, Chrome, and Oil Slick