A modular device, NODE communicates with smartphones via Bluetooth. Bluetooth requires less energy than Wifi and can send information directly to your Bluetooth enabled device. With new Bluetooth Low Energy, NODE can communicate with iPhone 4S and some Android phones at up to 50 meters with even less energy than conventional Bluetooth. With multiple NODEs networked in your home or office, you can control the different devices by your location.
NODE: a modular, handheld powerhouse of sensors - [Link]