Xiaomi BEEBEST are affordable transmitters with a range of up to 5 km and 12 hours - Xiaomi Planet
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Xiaomi BEEBEST are cost-effective radios with a range of up to 5 km and a 12-hour battery life

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wireless

The main problem with this product is that no specific channel frequencies are listed.
Therefore, the user in civilized countries is exposed to the risk of legal sanctions.
But amused that the use of phosphorbronz in the twisted wire antenna should help against interference :).
Xiaomi supplies a really wide range of products under its brand. Some are more successful, others less :).