Mpow Bluetooth 4.0 Receiver/Music Audio Adapter for Bose Sounddock & Other 30-Pin Analog Audio Speaker Docks SUPPORT digital products enabled with A2DP stereo Bluetooth, such as iPad, iPod touch, iPhone, Bluetooth cell phone, Bluetooth PC, PSP. Compatible with all devices enabled with A2DP stereo Bluetooth. THIS 30 Pin Dock can change the common Sound-Box to Bluetooth Sound-Box, maybe your smartphone will not fit on your old docking station, this can play your favorite songs in your device through a Bluetooth connection. COMPLIES with analog systems only, not works with digital audio system. Could not work with dock speakers in car. LESS music lag, and a more crystal-clear sound output. If the sound cuts in and out at 6-8 feet or connection disconnects frequently, please disconnect the connection of the receiver, reboot the product and connect again. HIGHER Bluetooth version, Bluetooth 4.0, providing better and more clear sound.