To activate the S4, all you have to do is say the hands-free trigger phrase "BlueAnt Speak to Me" and the S4 will be ready for your voice commands.
To make a call, just say "Phone Commands" and the S4 will activate your phone's voice dialing feature. *(If supported by your phone)
When the phone rings you won't need to take your eyes off the road to know who is calling because the S4 will read out the caller's name or number and ask you if you want to take the call. All you have to do is say "Answer" or "Ignore".

Hear Your Messages on the Go

The S4 integrates with Vlingo SafeReader so that you can hear incoming text messages read aloud. Once the Vlingo SafeReader application is installed on your BlackBerry® or AndroidTM 2.x smartphone, your incoming messages will be read out automatically as they come in.

A2DP Streaming

The S4 features integrated A2DP streaming audio functionality, so you can listen to music or podcasts and hear turn-by-turn direction information from a GPS application on your phone.

For Android Phones: Free Android Application

Users with Android devices can further enhance their BlueAnt S4 by installing the BlueAnt S4 Android application. The application provides text message readout directly into the headset and includes help and support for your S4.