The Sensirion Smart Gadget app allows you to establish a BLE (Bluetooth Low Energy) connection to your Sensirion Smart Gadget. The app displays the current temperature and relative humidity values measured by the integrated sensors. Up to seven Smart Gadgets can be connected simultaneously. The Smart Gadget is open hardware and runs open source firmware. <a href="https://github.com/Sensirion/SmartGadget-Hardware/">Smart Gadget Hardware</a> <a href="https://github.com/Sensirion/SmartGadget-Firmware">Smart Gadget Firmware</a> <a href="http://www.digikey.com/product-detail/en/sensirion-ag/SHT31-SMART-GADGET/1649-1024-ND/ Smart">Gadget from DigiKey</a> <a href="http://www.mouser.ch/ProductDetail/Sensirion/SHT31-SMART-GADGET/">Smart Gadget from Mouser</a>