This device is meant for ADVANCED USERS ONLY, a mechanical mod is highly dangerous if not used correctly. Generation V E-Cigarettes & Vape Bar will not be held responsible or liable for any injury, damage, or defect, permanent or temporary that may be caused due to the improper use and handling of the device. It is STRONGLY recommended that you should be familiar with the relationship between resistance and voltage as well as what type of batteries to use with this device.