Product Description Material: PU, heat-insulated cotton Size: 90mm Applicable bottle: suitable for bottles with a diameter of 6.5-7cm Quantity: 1 piece Package content: 1 insulated bottle cap, 1 USB charging cable. 1. This bottle warmer heats quickly and evenly, stretches to fit most bottles, easy and safe to use. Suitable for bottles: suitable for bottles with a diameter of 6.5-7cm. The velcro on the back can be adjusted to fit more bottles. 2. Portable, compact and compact design, easy to carry and store. The perfect solution for parents to warm their bottles comfortably, safely and easily while driving. 3. Sandwich heat insulation design Sandwich structure heat insulation design, heat insulation heating core flame retardant treatment, safety guarantee. The multi-layer material process is safe and reliable. The outer layer of the protective cover is made of high quality PU material, which is soft and skin-friendly, and the heating layer generates heat for a long time. 4. USB Charging: Comes with a USB data cable, just plug the data cable into the power bank due to USB port or laptop. The extra pocket of the bottle warmer can hold a power bank, allowing you to warm your milk anytime, anywhere. 5. Suitable for Different Materials The portable travel milk warmer is suitable for heating a variety of materials, which can heat plastic, glass and stainless steel respectively. During the heating process, the surface of the portable milk warmer does not heat up, and the temperature reaches 42 and automatically enters the heat preservation mode, which supports 24 hours of continuous heat preservation.