The Stentorian AT-7 Box Mod features a special computer chassis design inspired by modern PC gaming computers. Designed in California, the Stentorian AT-7 features a unique super large PCB with a brass radiation cooling circulation system. You may view all of the inside workings with the transparent case design. The Stentorian AT-7 Box Mod can fire up to 100 watts with no firing delay and features an auto-adaptive smart power output. The auto-adaptive smart power output automatically calculates the power and curve based on the resistance of your tank. The Stentorian AT-7 is powered by a built-in Li-Po 3500mAh internal battery that may be charged via the micro USB charging port located on the back of the device.