A wireless radio frequency switch controller may be capable of being retrofit on to any existing parent system such as a thermostat, security system, garage door, and the like. The switch controller may have an external housing, a contact penetrating clip, a processor capable of being connected to a network, and a computer readable storage medium storing one or more programs for execution by the processor. The bottom of the contact penetrating clip preferably has at least one cutting surface. The cutting surface being capable of cutting an insulative covering for an electrical wire, once the contact penetrating clip is secured to the switch controller. The switch controller requires no batteries and harvests/stores energy from the parent system's existing wiring. The switch controller may be capable of being paired with a wireless receiver/transceiver by which the operation of the switch controller and subsequently the parent system may be manipulated.