What is Talkback service in Ice cream sandwich/Jelly Bean 4.1 based Samsung Devices?

Samsung devices operating under Android platform of Ice Cream Sandwich 4.0 and Jelly Bean 4.1 comes with Talkback services which are designed to help people with low vision.  

Its an effort from Android Operating system to improve the accessibility services in smartphones making them equally usable by a user with low -vision. Following are few features :

● It reads out whatever buttons you use in your phone.

● It tells you your location in the phone.

One can change the settings of talkback services as per their comfort. Few of the below mentioned features are available :

● Assign specific sounds.

● One can use proximity sensor.

● Assign vibration patterns.