here introduction to 1sheeld turns into essential if you do not understand approximately it, as it runs the complete project.

if you know approximately the Arduino and its shields like GSM and WIFI, and additionally shopping for each of them for use is high priced. To update all of them with simply one, the Egyptian inventors made a notable single guard which connects to your android smartphone via Bluetooth and uses all of the sensors and connectivity of it. you could also use multiple guard at a time like GSM, WIFI, Accelerometer, Gyroscope and many others.

1sheeld - http://www.1sheeld.com/