Reddit reviews BriteLink Bluetooth Receiver for iPhone Dock. 30-Pin Adapter Turns iPhone/iPod docking station into a Bluetooth dock (Due to Dock Speaker Hardware Design, Some Models of Dock Speaker May Not Be Compatible) -- sold exclusive by CyberTech with 1 year warranty.
We found 2 Reddit comments about BriteLink Bluetooth Receiver for iPhone Dock. 30-Pin Adapter Turns iPhone/iPod docking station into a Bluetooth dock (Due to Dock Speaker Hardware Design, Some Models of Dock Speaker May Not Be Compatible) -- sold exclusive by CyberTech with 1 year warranty.. Here are the top ones, ranked by their Reddit score.
Bluetooth adapter with 30 pin connector. Works with iPhone/iPod docking stations including Bose SoundDock, SoundDock II, SoundDock 10, iHome iP90 and Logitech S715i.Use with any iPhone (including iPhone 5), iPad, Android phone and any device with Bluetooth.Bluetooth version 2.0 supporting A2DP for true stereo sound.Not compatible with some docking stations due to different dock station hardware design. Check detail list for models being tested OK.Provide compatible model not in the list to receive $2 discount for your order.
They sell things like this (I am by no means vouching for the specific one, just the general idea).
Do you need to charge the device? if not you can use this and connect via BT.