Stopped working in 3 weeks.

It is easy to install. I bought 2 of them (each pack has 2) when I saw a garden snake and have a child who runs around in the backyard. I installed 2 of them and it seemed to make some noise for a few days. Then one day it stopped working. I pulled it out of the ground to see if the wires were disconnected, but it was not. Now I have 2 unused repellers sitting at home and I don't know what to do. I am not even sure if these things are effective. Wasted my money.

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