The bontrager duotrap s digital sensor the integrated sensor that wirelessly transmits ant and bluetoothreg smart signals to your computer or phone the easy to use sensor installs in seconds and fits directly into the chainstay of select trek bicycles for a clean look and preserved aerodynamics the duotrap s is an ant enabled bluetoothreg smart ready integrated frame sensor that wirelessly transmits data to computer or phone easily mounts into integrated frames bontragern