Q&A (1) Question: 2 of the cups cannot be light up. Answer :This product is led flashing cups set, batteries are installed at the bottom of the cup, This product is composed of 24 flashing cups. If an external force collides, some of the cups may be separated from the battery plate at the bottom. The reason for the above problem is that we believe that the cups collided during transportation …
https://www.amazon.com/Flash-Light-Flashing-Shots-Night/dp/B075B5D5F2