Features: 23 Fixed temperature ranges, freely adjustable, blue low range 38°C~42°C, green middle range 43 °C~50 °C, and red high range 51 °C~60 °C. Quality materials, comfortable and environmentally friendly, skin friendly, washable, with thickened support at the bottom, wear-resistant and durable. Suitable for most 150ml, 200ml, 250ml straight tube milk bottles, pears shaped or wide mouth milk bottles on the market, and can also be placed with juice milk, etc. The side mesh surface can be widened that can hold a power bank and charge with a USB port, making it convenient and fast. It can be used in multiple scenarios and is widely used in various fields such as home, travel, and outdoor. Designed specifically for parents who need warm milk for their babies, this portable bottle warmer is a must-have accessory for parents whether they are at home, traveling, or outdoors, say goodbye to the trouble of wait for a kettle or finding a microwave oven. Specifications: Material: ABS, Silver Foils Paper Color: Rose Red, Blue, Yellow, Black(optional) Type: Hand Carrying Strap, Shoulder Hanging Strap(optional) Size: Approx. 13x8cm/5.11x3.14inch Package Includes: 1x Milk Bottle Insulation Sleeve 1x Strap 1x Charging Cable note: This product is not equipped with battery and cannot be charged, it requires an external power source for use. Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.