The eGo-C 1100mah Passthrough works at a constant 4.2v for hours non stop vaping! It also allows you to vape while charging on our computer, 500mA USB AC/USB adapter or dual car USB Power Adapter. The Passthrough has 510/eGo threading and will work with a variety of 510/eGo threaded atomizers, tanks and clearomizers. Some of the Best matches: Kanger Mini Protank-2, Vision V3 Single Coil & Vision V3+ Dual Coil Clearomizer and the Kanger eVod Bottom Coil and many more! The eGo-C Passthrough also has 3 kinds of Protections: 1. Short Circuit Protection: If a short circuit happens, the battery will shut down. 2. Atomizer Protection: If you press the button for 10 seconds, the battery will shutdown until press again to protect your Atomizer from overload. 3. Low Voltage Protection: When the battery voltage is lower than 3.3v, the batery will shut down. Also has a 5 click on 5 click off feature. Press the button 5 clicks within 2 seconds to turn battery on and off. Unit: 1pc Battery Size: Length 3 3/4"; Diameter: 7/8" Cord Length: 59" Capacity: 1100mAh Output voltage: 3.3v-4.2v Button Led: Blue Threading: 510/eGo Package: Simple Box How to use? *Screw off the bottom cap *Insert the USB cord into the bottom of the passthrough and connect to a USB port on computer. *Detach the USB port and use the battery separately when battery is charged fully. Note: * You can also charge the passthrough with a 420ma eGo Fast USB charger. Charging time: 2-2.5 hours.