Essential oil diffuser, which has a capacity of 100 ml, can be used as a car humidifier. The diffuser’s battery is charged by a rechargeable battery pack and it can last for up to 10 hours on one charge. It can also be used as a portable air purifier. Notably, there are no restrictions on the use of electric devices in cars due to its low power consumption. However, some users have complained that they cannot use their phones or tablets.