Portable bottle heater with digital temperature display and sixstep control for precise warming and longterm temperature maintenance. Key benefits Precise temperature control for consistent results: six selectable levels from 37 to 55 C with a builtin temperature display. Continuous keepwarm function: when the temperature reaches 42 C the device automatically switches to heat preservation mode and maintains temperature continuously for up to 24 hours. Broad bottle compatibility: designed for bottles with diameter less than 7.2 cm; the heater sits close to the bottle body for improved thermostatic effect and works with a wider range of bottle shapes. Convenient power options: can be used while charging via powerbank, car power supply, or wall adapter for flexible use at home or on the go. Safetyminded design: lowvoltage input and automatic overheating protection; requires input 5V 2A. Features and specifications Temperature range: 37 to 55 C, sixstep selection Display: builtin temperature display for realtime monitoring Compatibility: fits bottles with diameter less than 7.2 cm Keepwarm: auto switch to heat preservation at 42 C, 24 hours continuous keepwarm Power input: 5V 2A; supports operation while charging via powerbank, car, or adapter Safety: lowvoltage design with automatic overheating protection Note: bottle is not included Practical use scenarios Travel: maintain a readytouse bottle temperature during car trips or when away from home by powering the heater from a powerbank or car outlet. Night use: set the heater to the desired level and allow the unit to enter heat preservation mode so a bottle stays at temperature for up to 24 hours. Daily routine: warm and maintain beverages or feeding bottles at a stable temperature while preparing other tasks, using a wall adapter at home for continuous operation. This heater provides clear temperature control, flexible power options, and automatic keepwarm behavior to simplify warming and maintaining bottles in a variety of everyday situations. Bottle is not included.