Qualitative Materials---This USB baby bottle warmer is made of high-quality microfiber PU material, which is safe and non-toxic. Intelligent Temperature Control Design---This USB baby bottle warmer is 24-hour insulation when plug in, and adopts intelligent temperature control design, the four-layer design can lock temperature. Portable Design---This USB baby bottle warmer adopts portable strap and can be hung on the crib, the packaging is convenient and firm, not easy to fall off, which is ideal for outside walk, shopping and travelling. Easy to Use---This baby bottle warmer support power bank, USB, car charging, which is easy to use. Wide Range of Application---This USB baby bottle warmer can be applied to a variety of materials, such as water cups, mineral water bottles, milk boxes and so on.