A temperature control device includes a button which is located in a hole of a cloth and sewed along the periphery of the button. The control unit is located in the recess of the button and a fixing member is connected to the rear side of the button to secure the control unit in the recess. The wires of the control unit extend through the fixing member and are hidden in the cloth. The temperature control device is secured with the cloth and does not hang randomly outside the cloth so that it is protected from being scratched, pulled or compressed.