LOOK AT THE "APP SCREENSHOTS" TO LEARN HOW TO USE IT!Actually there are 3 buttons instead of one. For details look at the app screenshots.Great for conversation starter and to joke with your female friends1- Approach a friend and tell her about this new revolutionary app that works like a sonar on the cellphone and react differently with silicone.2- Point the cellphone to yourself press the big red button in the lower section and it will display "SCANNING", gently slide your finger to the tiny left top and press AGAIN and it will display "REAL BOOBS"3- Try again but this time point the cellphone to your friends and instead of sliding to the left, slide it to the right tiny top of the "SCAN" button and it will display "FAKE BOOBS" .TRY SOMETIMES ALONE UNTIL YOU GOT THE PERFECT TIMING- This app it’s just for fun, the only function here is to get some laughs. =DEnjoy It