The RS-MS1A (for Android™ devices) allows your Android device to wirelessly connect to a D-STAR transceiver and remotely set DR functions, link with a map app and send/receive messages in DV mode.
The RS-MS1i (for iOS™ devices) allows your iOS device to wirelessly connect to a D-STAR transceiver and remotely set DR functions, link with a map app and send/receive messages in DV mode.