What is this tube full of balls in the wall in a home built in the mid 90s.

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image showing What is this tube full of balls in the wall in a home built in the mid 90s.

R6Dragon on May 21st, 2019 at 00:17 UTC »

There seems to be one in almost every room and every ball through the clear plastic is green. They don't move at all. The white wire or "stick" is a different color in each room. They are only on the lower floor in the living/kitchen area, storage room under the stairs, hallway, utility room, and one bedroom.

R6Dragon on May 21st, 2019 at 00:45 UTC »

Attempting to link to more pictures with the tube pulled out further:

https://imgur.com/KM7kwNk