Disappointed. Does not fit in our car cup holders and cannot charge with the car charger adapter. It does not work on trips or when away from home because the battery runs out and you need the coaster with you at all times as that is the only way. It would be great if it had a usb-c charger to plug into cars or battery packs. It also is not insulated and is hot to touch. I wanted to love it as we love our mugs and travel mug but couldn’t due to all these issues. Sent back for refund.