Quick Heating & Precise Temperature Design: Portable bottle warmer can warm 4oz to 98℉ in as little as 3 minutes Choose from 80℉, 98℉, 103℉ or 110℉ Portable for travel & cordless design: Warm up to 8 bottles before needing to recharge. Holds temperature for up to 12 hours. Super Battery Capacity: The Baby's Brew bottle warmer features a large battery capacity that can last for 8-12 hours after a full charge, which typically takes between 3 to 4 hours. Additionally, it comes with a USB-C charging cable. The perfect solution not only for shorter day trips, but also for longer excursions such as vacations, or road trips. However, please note that the device cannot be used while charging. Safety Heating & Leak-proof: Baby's Brew portable bottle warmers feature a food grade stainless steel warming plate and that effectively preserves the nutrients in breastmilk. This design ensures that your baby's milk is evenly heated. Leak proof silicone ring ensures that all of your baby's milk stays in the bottle. No more crying over spilled milk! Our Portable bottle warmer fits most wide neck bottle brands (Avent, Chicco, SpeCtra and more), plus we offer a variety of separate adapters to fit other sizes including Dr. Brown's Narrow and Wide neck, Medela, MAM, Comotomo, Boon, Tommee Tippee, NUK Parent's Choice, Nanobebe and many more.