The [https://www.puck-js.com/ Puck.js] is a small bluetooth enabled beacon which also includes an accelerometer, temperature sensor and light sensor as well as a button. It can be programmed via JavaScript. [[User:Gedankenstuecke|Gedankenstuecke]] made a website which allows to [https://tzovar.as/one-button-tracker/ turn a standard Puck.js into a One Button Tracker].
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Pros:
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* readily available to buy online
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* comparatively cheap (~25 GBP)
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* simple to set up
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Cons:
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* not specifically designed for the use as a one button tracker, thus:
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** prone to accidental button presses
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** website for data export doesn't always work as expected
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** can break comparatively easily (e.g. when sitting on it)