BlueAnt S1 Bluetooth Car Kit The S1 also features multipoint technology, so you can connect two phones at the same time and answer the one that rings The BlueAnt S1 also introduces A2DP music streaming, allowing you to play music through the S1's high performance speaker from any cell phone that supports the A2DP Bluetooth profile. In addition to playing music over A2DP, the S1 can also be used with cell phone GPS applications that communicate through A2DP (such as the iPhone Tom Tom GPS application). This means you can use your S1 to hear turn-by-turn direction information from your GPS application