Cooler Mode: 3 adjustable levels: The cooler mode is quick cooling, and the temperature can be switched between 3 levels, including low (approx. 78°F / 25°C), medium (approx. 44°F / 20°C), and high (approx. 59°F/15°C). Stay cool and comfortable even in midsummer outdoor such as theme parks and outdoor activities. Depending on the ambient temperature and the environment, the set temperature may not be reached. Warmer Mode: 3 adjustable levels: The warmer mode instantly warms up and can be set to 3 different temperature levels, including weak (about 39°C), medium (about 144°F (42°C), and high (about 45°C), so you can warm your neck even in the cold winter. In addition, due to its thermal effect, it is effective in preventing the cold even in summer. Depending on the ambient temperature and the environment, the set temperature may not be reached. (Safe Empty Firing Prevention Function (Warmer Mode): To prevent low temperature burns, the power will automatically turn off when the plate temperature is 10 seconds after 10 seconds at 10 degrees. Hands-Free Use Anytime, Anywhere: The hands-free design allows you to hang it around your neck so you can use it not only for outdoor activities such as going out to theme parks, festivals, sporting activities or watching sports, but also for working in the office or remote work. Built-in battery: Cordless type with built-in 2,600 mAh battery, no need for bulky external batteries. Since it is USB rechargeable, you can use the included USB cable to charge it even with a PC or mobile battery etc. (You can also use it while connecting it to a power bank) (Reliable Japanese Quality) Products we deliver are inspected at our own factory (Niigata). It also comes with a Japanese instruction manual (English language not guaranteed) so you can use it with confidence. Product Specifications: Input: DC 5V-1.5A (USB rechargeable); Battery Capacity: 2,600 mAh (lithium ion battery); Charging Time: Approx. 3 hours; Continuous Operating Time: About 2 hours; Warmer: About 2 - 5 hours (*1); Cooler Setting Temperature: Approx. 68°F (25°C); Approx. 42°F (15°C); Warmer Setting Temperature: Approx. 9°C; Approx. 142°F (42°C). Approx. 108°F (45°C). (2) Material: ABS, Silicone, Aluminum; Size: Approx. 6.7 x 5.8 x 1.6 inches (170 x 147 x 40 mm); Weight: Approx. 8.1 oz (230 g); Warranty: 6 months from the date of purchase; Country of Origin: China; (*1) The time when installed in an environment of outside temperature of 77°F (25°C). (*2) The surface temperature of the plate when installation differs from the temperature of each set. Please make sure to use the included charging cable when charging. Other cables may cause charging or failure. The **period for this product is 6 months from the date of purchase. We will replace it for a failure within the **period. As the metal parts come into contact with your skin, please do not use this product if you are allergic to metal or have a danger of this product.