iBeacon for simple presence detector

Hello.
What i need to buy for simple presence detector via iBeacon for me and my wife?
I think about a small tag to key chain to detect it in home or away.

Now i use iCloud presence but battery drainage is huuuuuge. At night from 100% to 24% in 8 hours.

Thx for any advice.

Regards
Ed

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Here’s someone using Happy Bubbles in a way that is similar to your request:

I personally use OWNTRACKS. To supplement the sometimes flaky GPS location, I added this Bluetooth beacon to my living room :
https://www.amazon.com/gp/product/B00JI69JZY

Is any chance to share your configuration to improve owntrack localization?
I need only information enter/exit home zone.

Inside the Owntracks application, I simply add the UUID of my ibeacon device to my Region called Home.