The Tesla Two Box Mod is the perfect compact unregulated box mod. It features 2 internal batteries for a total capacity of 4000mAh, which will last most vapers an entire day or more. Charging the device can be performed with any standard micro-USB cable. Voltage output is fixed, with a maximum output of 4.2V with a fully-charged battery. The Tesla Two features a spring-loaded silver-plated copper positive pin for excellent conductivity. Because there are no adjustments to be made, operation is extremely easy: hold the fire button with an atomizer attached to fire the device, and click the fire button 5 times to turn the device on or off. Minimum resistance is 0.1ohm, making this aluminum mod perfect for those looking for an alternative to bulky and heavy mechanical mods! Ideal for RBAs and sub-ohm tanks!