possessing all the runtastic apps for their effectiveness I needed their new tracker! Finally done! After a month of use it perfectly meets what is required and those for which it is done !! Already for the comment like it not my calculation distance swimming er ... sorry Normal - ' In short it mates perfectly with the smartphone application in real time and therefore need to have the phone on the arm we put it in the bag in the pocket and you can still follow its activity :) For the number of steps recorded after several attempts with the storyteller lit under the eyes I find accurate and efficient. Regarding followed sleeping too am amazed at its accuracy I wake up at night even 1min he saves me and I can see the next day! The good night are registered but as so bad surprise! Its weatherproof and of course a plus for the pool the sea the brief shower Revival and really effective and easy to use longer need a laptop that sounds or alarm clock that makes noise in the morning. The vibrations are really sufficient ^^ ' For Happy tracking is a useful gadget to tell when we're happy In short I recommend it especially for owners of runtastic apps!