RENPHO R-C004 - What do the lights on the bottom mean?

The LED indicator lights on the top of the massage gun indicate two things:

The battery power remaining on the gun. the four lights closer to the type C port represent how many quarters of battery are left, for example, 3 lights indicate that 3 quarters or 75% of battery remain, and 1 light means that 25% of battery remains.

• If the last LED is on and starts flashing, it means that only 10% of the battery remains and you should begin charging it.
• When charging, the light will flash blue, and when the become a solid blue, it means that the battery is fully charged.

The four lights further away from the type C port represent the speeds of the massage gun. The more lights that are lit up, the faster the massage gun will operate, although higher settings will consume more battery, they can be used for more intense massaging needs.