USB Coffee Mug Cup Warmer

1. When there is no cup on the top, it is normal for the 3 lights to flash together

2. When there is no cup, if one light is turned on, it means that the bottom gravity switch is pressed by something.

3. When the cup is placed on the top, the 3 lights flash together, the bottom gravity switch is not pressed, maybe the cup is too light or no water in the cup.

4. Three lights flashing back and forth, the reason is insufficient current, please make sure that your adapter is above 5V-2A

5. There are two keys only can be pressed, rightmost key and leftmost key. The other keys can't be pressed. 

6. Please use the flat-bottom cup, do not use concave bottom cup

7. Please make sure the input voltage and electric currect ≥ 5V 2A

Solution:

1. Try to press the bottom gravity switch 

2. Use 5V-2A adapter, original USB cable