Yes, the CoolStream Duo is compatible with the Cambridge 765i docking station. You can plug the Duo into the 30 pin connector of this docking station to stream music or podcasts from your phone, tablet, or laptop. The CoolStream Duo works with All iPhones and All Android phones.
The CoolStream Duo turns older docking stations like this beauty from Cambridge into Bluetooth speakers. The 30-pin iPod connector powers the Duo and is also the audio jack for the music coming from the paired phone. You can leave the CoolStream Duo on the dock all the time. It will not hurt your docking station nor the Duo’s rechargeable battery.
For more information about compatible (and non-compatible) docking stations, check out the Docking Station Compatibility page.