1HOT COMPRESS TECHNOLOGY: The neck warmer uses conductive hot compress technology to effectively promote blood circulation and warm up the whole body 2INTELLIGENT TEMPERATURE CONTROL:The neck warmer has a built in sensor to ensure stable temperature and automatically choose to adapt to human body temperature 3DIGITAL DISPLAY: The neck warmer has 4 level temperature options of 40, 45, 50, 55, intelligent digital display temperature control gives you a safe experience 4ELASTIC ARM TECHNOLOGY: The elastic arm technology of the neck warmer can produce a rebound effect, and its toughness gives you a more skin friendly and soft feeling 5SMALL and PORTABLE: The neck warmer is small and portable, convenient for you to carry and use anytime, anywhere Item Type: Neck Warmer Material: ABS, PC, Aluminum Alloy Voltage: 5V Current: 2A Power: 8W Temperature: 40, 45, 50, 55 Screen Display: LED Digital Tube Display Battery: 18650 Lithium Battery 10000mAh (included) Charging Time: Approx. 4.5 Hours Working Hours: 6.5h, 6h, 4h, 3.5h Weight: Approx. 526g/18.6oz 1 xNeckWarmer 1 x USB Power Cord 1 x User Manual Shipped with Built in Battery