Very small battery and mediocre call quality. The main issue, of course, is that the mark is different for each one. 50 kilometers away from the location of the watch

Definitely good for the cost. I successfully tried it with the "SeTracker2" app (by QR code scan, not with "DoWear" as mentioned in the quickstart) and with a relatively new sim from Vodafone.

Positives: Easy registration for the service (required). The sos button immediately sends sms to all numbers (up to 3) and simultaneously starts calls. It can block calls from numbers not in contacts (useful for children).

Negatives: I couldn't find an online manual, while the quickstart doesn't exactly match. The placement of the sim is a bit difficult. The device relies on mobile phone signal (GSM & LSB) and not real GPS, so it lacks accuracy (expected for a tracker of this cost). It is not waterproof, as there is an opening in the cover. The mobile app contains ads (which can be removed with payment, I think).

It is not for what it claims
Just one call and it leans from the battery
Connection to the device is impossible