Lasting oil compatibility with 5/10/15/20mL essential oil bottles, minimizing the need for frequent refills. Cordless design with a built-in lithium battery that lasts up to 48 hours on a single charge. Quick recharge time of approximately 3.5 hours using a standard USB-C cable. Durable cylindrical body that fits most car cup holders for easy portability. Water-saving design that eliminates the need for water, ensuring consistent and reliable scent diffusion over time. Designed to work with 5/10/15/20mL essential oil bottles on the market. A single 20mL bottle can deliver days of continuous fragrance, depending on setting, minimizing the need for frequent refills. Installation is a breeze. Simply remove the cap from the retail oil bottle and screw the oil bottle onto the nozzle, or pour the oil into the oil bottle supplied in the box. The strong, durable design features a cylindrical body that fits most car cup holders, making it easy to take on the go and enhancing every vehicle journey with lasting fragrance. Color: As Shown Material: Aluminum Alloy Package Contents: 1*essential oil diffuser Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.