Meet the Tye*: a 3-in-1 security solution that serves as a mobile alarm, lock, and tracker. You can use it to protect your electronic devices, secure static objects, and track things. It has sensors to detect any attempt at tampering and set off an alarm to deter any intrusion. The Tye* system has a hub that gets attached to what you want to protect, a remote you take with you, and a retractable USB cable.
You can use this solution to keep an eye on your phone when it is getting charged, avoid losing your bag, and deter bike theft. There are no wires or monthly fees required to use this device. Tye* can be even used to track your pets. The companion app lets you configure the hub and remote. Yet another interesting Kickstarter project.