Meet Sensor-1: a smart security system that fits in the palm of your hand and detects real time changes in motion to alert you. You can arm it based on your proximity. Sensor-1 does not need a mobile app to work. It logs motion events when you are out of range and can communicate with smartphones, tablets, and laptops.
Sensor-1 has an API for custom app development. It helps you avoid leaving your items behind. You can use it to keep an eye on important documents, doors, drawers, bicycles and everything in between. Yet another interesting Indiegogo project.