I wish I had bought this sooner! which was almost identical in size as the smaller boots that I just returned. I sometimes run in London and sometimes on pitch black rural lanes - either way it?s good to hear what?s going on. Ok app. You need to download Timesiso app on your phone and then once you turn the ear cleaner on you just connect straight to it from wifi settings. Overall though, good quality, soft fabric, no weird smells. Could be stiffer. Im not a tech expert but Im really happy with this purchase. Excellent sound quality, plus the mic has not failed me once. Need a full size up.