CSCC - 510 Thread Spin Mini Battery (Black) - 2.0 - 4.0 Volt

Flex Connect: Spring loaded to reduce connectivity problems. Battery Juice Indication Light: Tells you when to charge it up. (Green = Good, Yellow = Warning, Red = Dead) 2 Click Preheat Mode Spinner Dial: Adjust Temperature from 2.0 to 4.0 Volts (2.0 = Great Flavor, 4.0 = Huge Hits)