inputs.text: fits perfectly no manualinstruction - small washable pouch nike sensor secures sensor stable constant position not instruction manual included people find pretty straightforward easy install rehemehember keep flat surface sensor pointing upwards insert pouch unlace shoe start inserting first cross shoelace bottom shoelace flaps pouch continue crisscrossing shoelace find appropriate height insert shoelace upper shoelace flaps pouch would best install pouch left shoe walking running calibration installed new position sensor would impact recording walk run