In the modern age of mobile devices, breaking out the bulky laptop to make modifications to your sound system can seem like a chore. That's why Dayton Audio has given you the option to connect to your DSP via your Android or iOS mobile device using the DSP-BT4.0. This Bluetooth 4.0 dongle allows users to completely tune their DSP via the mobile DSP-408 Android or iOS app. In addition, the user can also use their mobile Bluetooth device as an audio source, and stream directly to the DSP itself.