title: Android Bluetooth VS Bluetooth Low Energy
body: <p>I am trying to create an application that needs to exchange small size of data -  just to notify that the devices are close enough - for as long as the smart phone is running. It is my understanding that the traditional bluetooth consumes significant amount of battery so that having it turned on for hours is not viable. I am looking at BLE but still concerned with the battery capacity.</p>
  
  <p>Q0 Is it possible to have BLE turned on as long as the phone is running?</p>
  
  <p>Q1 Is there a difference between the two technologies with respect to signal distance? and how far can they travel?</p>
  
  <p>Q2 Is there any limitation on number of devices that can be connected simultaneously?</p>
  
  <p>Q3 Does battery consumption varies depending on the size of data exchanging?</p>
  
  <p>Q4 If the devices have to be connected and disconnected number of times, would the phone be able to tell the time difference between the connection?</p>