This JOYE 510 silver charger box holds 2 spare cartridges, 1 atomizer and 1 battery.  It will also charge your dead battery and keep it safe.  This accessory is a must have with the 510 if you take them out of the house and need a charger.  I love my 510 but the battery life is lower than most other e cigarettes.  This set comes with a battery an atomizer and 2 carts.  It will charge from a USB port or from the included wall plug adapter.