Wireless data transmission is achieved over Bluetooth connectivity, and with the relevant control buttons, cyclists are able to operate their favorite iPhone cycling App, in addition to toggling between screens, start/stop intervals and even control iPhone functionality, all from the RFLKT itself, without endangering your iPhone to possible drops or falls on the outside. Since the RFLKT maintains a sleek profile and tips the scale at just 2 ounces, having it around is more or less unnoticeable even when mounted. Who says you cannot work out and look cool at the same time? [Product Page]