CX.Li USB Bluetooth 3.5mm Stereo Audio Music Receiver Adapter for Speaker iPhone Mp3 answer the phone functions using the latest Bluetooth V4.0 technology,data transfer rate up to 10Mbps triple the current Bluetooth technology,which ensures a more stable wireless audio transmission,thus providing high-quality voice,data transmission and shorten the time,reducing the power loss. compatible with all A2DP stereo Bluetooth devices including iPad,iPhone4,iPhone3G/3GS,and other Apple products on the market including Android. support all speaker programs. Bluetooth audio playback,answer the phone functions. key functiongs:on one/volume down under one/volume plus play/pause to answer the call/hang up the phone functions.