From bigclivedotcom.

When I bought this I was expecting a simple vibration switch and an LED that flickered when movement was sensed. What I was NOT expecting was a microcontroller and a multi-axis accelerometer chip.

But here we have it. A fishing float that costs 1 or 2 pounds/dollars, and yet has solid-state motion sensing.

This unit came from AliExpress (not a sponsor):-
https://www.aliexpress.com/item/1005007010158024.html

The unit did not come with the required CR425 lithium cell, but they are commonly sold with other floats and matching chargers for the ones that can be recharged.

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