an extender, comprising:

a first connector having a connector body including a first forward mating port, a plurality of terminal passageways formed in the connector body to communicate with the first mating port, a plurality of terminals received in the respective terminal passageways with contact sections exposed in the first mating port; and

a second connector electrically connected and disposed in a back-to-back relationship with the first connector, the second connector having a base including a mating tongue exposed in a second mating port, a plurality of contacts disposed on a same face of the mating tongue;

a receptacle defined upon a top wall of at least one of the first and second connector;

a thermal sensing device received in the receptacle; and

a cover assembled onto the receptacle for covering the thermal sensing device, the cover defining a plurality of through holes to communicate the thermal sensing device with the outside; wherein the thermal sensing device comprising a thermal transistor, a first thermal connector having one end electrically connected to the thermal transistor and another end electrically connected to a cable, and a thermal pad located outward of the thermal transistor and the thermal connector to communicate with the outside and adapted to conduct the outside heat to the thermal transistor; wherein an entrance of the receptacle at one side is walled up by the thermal pad.