How to use the hand warmer. Switch on: lightly press the switch to activate and show the power as blue light, show blue light when charging the phone Heating: long press for 3 seconds to start the heating function as red light, after 30 seconds or so the temperature rises, lightly press to adjust the temperature, a red light 1 file 45 degrees, two red light 2 files 50 degrees, three red light 55 degrees Switch off: long press for 3 seconds to switch off Automatic power off protection, so that you can use a safer and more secure, intelligent temperature control system will automatically power off to prevent long time heating. Ceramic heating technology, 360 degree heat preservation, the heating body uses ceramic heat dissipation technology, the heating time can last about 5 hours under heat preservation. No need to fill with water, safe and explosion-proof, built-in high-capacity polymer lithium battery, using dual temperature control electric heating storage type structure, gradually release heat energy. 5200 mA high capacity lithium battery, rechargeable on the go. This creative and loving hand warmer is not only for visual beauty, but also for humane use. When sending it to someone, it sends the blessings of one"s heart, hope together, symbolising our hope, blessings and happiness of passing on the reservation. Size: 97*53*22mm Colour: Sky Blue, Silver, Champagne Gold, Rose Gold (optional) Packaging includes. 1 * Hand warmer