The Mate tiles are powered by CR1632 batteries, which are user replaceable and guaranteed to run for one year

The app also works perfect and has great user interface.

The Mate Tile, on the other hand, has a user-replaceable battery, a CR1632 button lithium

I've used Tile in the past and have been pleased (but not in love with) with the big sticking point of not having user replaceable batteries, they always seemed a bit expensive for what they do