Hand Warmer Mode Long press the button 2 seconds to enter hand warmer mode, the first orange indicator light is the level 1 of temperature; short press the button again, the first and second orange indicator lights is the level 2 of temperature; and so on total is 4 levels of temperature control. Long press 2 seconds to turn off. Power Bank Mode Short press the button, power bank function start and shows white electricity indicator. Power bank mode is preferential, when it access to external devices in heating mode will automatically switch to power bank mode, both modes can not work at the same time. Lighting Mode Quickly double-click the button to turn on or off the light. Lighting mode and hand warmer mode or power bank mode can work at the same time.