BlueAnt S4 True Handsfree Speakerphone & Wireless Bluetooth 2.1 [In BlueAnt Original Retail Packaging] Item is in Blueant Retail Package Hear Your Messages on the Go: The S4 integrates with Vlingo SafeReader so that you can hear incoming text messages read aloud. 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. Free Android Application: Users with Android devices can further enhance their BlueAnt S4 by installing the BlueAnt S4 Android application. 3.7V Rechargeable Lithium Ion Battery, Up to 20 hrs talk time; 700 hrs Standby time; 3-4 Hours charging time;