4 in 1: Essential Oil Aroma Diffuser + Car Charger + Mini Emergency Hammer + Air Purify. Easy to use: standard car charger interface, just plug directly into the 12V outlet. Using constant diffusion technology to remove odors. It is designed with separated USB interface, can directly connect to USB interface to use in the bedroom. The bottom of the car charger is designed as a safety hammer. Small size and easy to carry. Your logo is welcome.