The seven LED indicators on the front of the hand warmer are simple and useful. The first four are labelled 1, 2, 3, and 4. These are indicators of remaining battery life
The next is marked "C", and will light up to indicate that your phone or other device is charging
The final two are marked T1 and T2, and indicate which temperature setting is being used
When the button on the right is pressed once, it will reveal the power levels, and if pressed twice in quick succession, it will turn on the Warmaplates™, lighting up the first T1 LED. If pressed again, it will move up to the second temperature level. The button on the left is used to turn on the torch function - press once to turn on the continuous light, twice for the flashing light, and again to switch the light off.