This candy sized battery power sensors are developed by Bart Zimny and Andrzej Pawlikowski live in Poland called “Clime”. This tiny sensors can sense CO2, Temperature , Light, Motion, Color and Pressure. You Just sticking this tiny sensor to the any surface and it will communicate with your smartphone with an Application using Bloutooth 4.0 . Each sensor has a mini battery which stands 1.5 years then you need a new battery.
This affordable sensors are available at the price of US ($15), the UK (£12), and Europe (€15) in October 2014.