Have purchased a Bluetooth LED from a recent visit to Singapore and initial tests are very promising.. Last Night (Sunday) set everything up and downloaded the App to my phone. You need to use your existing DJI account details for the initial log on and after the app will display the word scanning until it has connected, it is all very straightforward. The best thing about this though is the ability to tweak the gains and settings etc while the model is flying which saves time and shows the effects of the tweaks immediately. I can see that this will become an invaluable tool for enthusiasts. One small point though is that the App showed an available update which I downloaded this which then gave me a firmware version mismatch between the Blue tooth LED and the WKM so an upgrade to the WKM is now necessary. Initial tuning of a new set up would benefit greatly from this as it saves so much time, my model flies like a dream thanks to Geoff at Quadcopters.co.uk but always looking to push the limits that little bit further I adjusted some settings and have refined the stability even further. In Singapore the unit cost in the region of £66 - £68 while in the UK it is advertised in the region of £79 and while it really is a time saver once again DJI have extremely high price points on there products. Just a pity that there support is non existent considering their prices..