Although Not Yet Available,

I thought this was a neat idea for the security conscious,

it is called Sensor-1 and at 1” square it is small enough to mount on or in most items you want to protect, there are three different mechanisms to monitor movement: a gyroscopic stabilizer, an accelerometer, and a magnetometer, these three sensors work in harmony to provide accurate location and position tracking, using the Aletha Mobile app, you can set the sensitivity and you can even set it to arm based on your proximity and set up alerts in case you accidentally leave the Sensor-1 (or what it's attached to) behind, although it is not mention I guess a waterproof one could be made for items like, bicycles, lawnmowers or pretty much anything else of value left outside, the Sensor-1 is currently being funded on IndieGoGo and is already well on their way to making goal, it will be available on iOS and Apple Watch and made available to Android late 2016 and no I am not on commision, I just thought with more people on the move carrying laptops and using bicycles it was a neat idea!