The OBS KFB2 starter kit is an all new upgraded version of the KFB kit and now features a 1500mAh built in batter that works with a low power output and constant voltage at 3.5v. Like many other pen style all in one kits the OBS KFB2 uses a one button option that’s ideal for beginner vapers. Adopting a 2ml e-liquid capacity and featuring two coils, a 0. Ohm S1 mesh coil and a 1.2 Ohm N1 coil, both are designed for flavour production.