trek verve disc lowstep

[Gibby_3]

what is this

 

[vickster]

Google is your friend
https://www.trekbikes.com/gb/en_GB/...duotrap-digital-speed/cadence-sensor/p/08298/

 

[Gibby_3]

how do i hook it up to my phone ?

 

[si_c]

how do i hook it up to my phone ?

You don't, at least not yet, the duo trap module is a £40ish accessory you buy separately which measures how fast the wheel turns and thus speed. What you see in the picture is the cover that goes over the socket it fits in so there isnt a hole in the bike frame.

If you are using your phone and want to get one you need to check the app you are using supports external sensors.