The Suorin Drop All-In-One Starter Kit is designed to be incredibly compact and easy to use. It features a water droplet design which is very light and portable. It has no fire button and has a built-in 310mAh battery that can be charged via micro USB. It has a 2mL refillable cartridge that can be refilled up to 5 times. We recommend 30/70 PG/VG Ratio Eliquid in this device.