The WYE by Tesla
The Tesla WYE 200w Box Mod is the lightest 200w Box Mod on the market.
With a resistance range from 0.1-3.0ohm and Temperature Range: 100-300℃/200-600℉
it takes two 18650 batteries, which can be charged via a USB port.
The Wye will charge batteries to 4.2 Volts, then discharge down to 4.1, then rebalance the batteries back to 4.2 Volts
it has three memory modes, so you can configure your mod for favourite tanks and RDAs, it also features a curve setting and a normal, soft, hard and user firing options.