Abstract: A strap with transmission line functionality includes a strap body, a first connecting end and a second connecting end. The strap body has at least one signal line wrapped therein. The first connecting end is disposed at one end of the strap body and the second connecting end is disposed at an opposite end of the strap body so that signals can be transmitted between the first connecting end and the second connecting end via the signal line disposed in the strap body. The first connecting end is directly fixed to and electrically connected with an electronic product, and a signal connector is also disposed at the second connecting end to connect with an external device. The strap body is substantially looped into a circular form so as to be used as a wrist strap or a neck strap of the electronic product.