Cup holder expender: the expandable base can adjust from 2.6-3.8 in diameter to fit different kinds of automotive cupholders. Just twist the base of the adapter to expand or retract the base and it can be firmly fixed on the cup holder of your car. Especially suitable for cars only have one cup holder.

Silicone shrapnel : The Silicone shrapnel of car cup holder insert can make cups easy to put and remove from the adapter. Ensure that the cup is fixed in the cup holder when you are driving, will not shake or fall, and avoid bottle body friction.

Phone storage box: the side of car cup holder has a mobile phone storage box that allows you to put the phone and get it in anytime. Avoid that sometimes you can not find your phone or it falls into the seat gap.

U-shaped slot: this design is very convenient that cups or mugs with handle can perfectly be placed in this car cup holders without tilting or splashing.

Suitable for different sizes: The Silicone shrapnel allow the adapter to work with bottles/cups 2.8-3.8 in diameter and fits most 20 oz-40 oz water bottles.