Re: Trackers (GPS or BT)
Well that page is an ad.
I've seen these before though. It won't track it unless it's near a phone and the idea is that it's crowdsourced so if someone else has a trackr it can pick up others thereby giving 'the last known location'. However it's unlikely to work well as so few people have them and, at least on iOS, the app will have to be open for it to pick up.
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