Absolutely, it does its job. It helps me find the mobile and vice verca, but!
It's the worst wear and tear product I've used and I'm embarrassed ecologically that I own one. The battery (which is actually a regular 25-krone button cell variant) is completely built-in and can not be changed. If you have a year's good and just one year after you bought, an email comes with a shabby offer to buy a brand new with a slight discount. Will NOT buy a new one.