The CE5-S is an upgraded version of Aspire CE5 Clearomiser it has an exterior metal sleeve surrounding the tank with two small windows that allow you to see how much liquid is left in the 1.8ml tank. It also has a replaceable drip tip that can be replaced with any 510 drip tip. 510 threaded, fits all 510 devices, including Kanger EVOD battery, Kanger EVOD VV battery, Vision Spinner Battery. One coil of 1.8 ohm resistance is included in the package. If you need additional coils, you can buy a 5-pack of Aspire BDC Coils.