The charging port has an on/off switch conveniently located on its side. Simply attach a roll-on wax warmer (or three), put in the wax cartridges, and turn on your base, or just plug in each base. Each roll-on system gives you 30 minutes of cordless use before each warming, which is plenty of time for successful service and features a curved center body to comfortably glide on an even layer of wax in one stroke to cut waxing time by 50%.