We have had similar products to this before with the CHIPOLO which at the time was a let down due to the app failing to connect with any consistency, so I started my test of the Lapa 2 with a degree of scepticism. I downloaded the app (compatible with iphone 4 +, ipad 3rd gen + and Android 4.3 +) synced the Lapa 2 and attached it to my keys without any difficulty, the free app provides a simple enough walkthrough.