LEGO Technic team is running a competition from their website.
It is an initiative to promote the LEGO Building Instructions app for Android and iOS, which includes easy to follow digital instructions for some of the mid-sized models in the LEGO Technic line.
All one has to do to enter the competition is to install the app, go to the LEGO Club website and use the app to identify the LEGO Technic model whose image can be seen at the website.
You can win an iPad and/or LEGO Technic sets during four weeks (two weeks still to go).
Find the full details here.
Unfortunately the Android app is still compatible with just a few devices and not available to install with the rest, although it should work fine with much more. LEGO seems not willing to carry the tests that would allow to release the app to many more devices with confidence.
It was somehow easy to download online from Google Play store, the previous version of LEGO Building Instructions Android app, but this seems to have changed after sometime and consequently never managed to download and install the latest version 1.1.1 which adds instructions for 3 new 2015 models.
Don't think this is a true limitation to enter the competition, since should be much difficult for you to borrow an Apple device for the purpose, or even easier to find the model the image belongs too, if you are familiar with the recent LEGO Technic sets.
More difficult should be to enter the competition if you are not in one of the countries where the competition seems to be available (Belgium, Czech Republique, Denmark, Germany, France, Netherlands, Norway, Poland, Finland and UK). All other languages where LEGO.com website is available, doesn't show this competition - Tell us if you succeed!
Good luck and tell us if you have won!