Press and hold the power button for 3 seconds to turn on the hand warmer, and the heating function is activated. (The first white battery indicator on the side of the product is lit, and it enters the low temperature setting by default, and the display shows the current temperature at the same time)After entering the warm hand state, press the power button again to switch gears. (The white battery indicator lights on the side of the product are one, two, and three in sequence)The hand-warming state product design has three gears, high, medium and low. The product defaults to the low temperature setting when it enters the warm hand state after power on. High temperature file: three white lights are on at the same time, the temperature is (55) degrees Celsius,At the same time, the screen displays the current temperature.Low temperature gear: a white indicator light is on, the temperature (45-50) degrees Celsius, and the screen displays the current temperature at the same time.Press and hold the power button for 3 seconds to exit the hand warmer mode and power off.Use the power cord of a mobile phone or digital device to connect the hand warmer to charge the digital product. When the heating is not turned on, short press the button for about 1S, the power will be displayed automatically, and the display will be automatically turned off after 5S. The remaining memory power is displayed by LED white lights, 1 white LED light is on for 10%-30% power, 2 white LED lights are on for 30%-60% power, and 3 white LED lights are on for 60%-100% power.Colour:BlackMaterial:ABS+Aluminum alloyPackage Contents:1 x hand warmer1 x charging cableOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.