A push-button on a device includes a shell of the device, an internal locking portion to connect with the device, a touch pole far away from the locking portion, and a supporting flange portion extending from the internal surface of the shell. The supporting flange portion and the device support each other. When the shell is pressed, the push-button elastically deforms as the locking portion 103 acts as a fixing point and the supporting end acts as a supporting point. The touch pole moves with the shell and the switch on a PCB is triggered to generate at least one signal.