Patent ID: 7081816

Claim:
A compact wireless sensor assembly for detecting a change of state comprising: a housing unit having an exterior top and side wall defining an interior space in which the side wall is no greater than 1 inch, said housing unit being of a size and shape that can be inserted within an existing conventional window or door frame without being generally visible from the front or rear; a switch capable of detecting a given state and a change of state between the given state and at least one other state; a microprocessor being able to sample the state of the switch at select intervals and revert to an idle mode; a PCB, a wireless transmitter that can receive a signal from the microprocessor identifying a change of switch's state and transmit the signal from the microprocessor via a wireless antenna; a timer connected to said microprocessor for sampling the switch at the select time intervals; and a power source connected to the PCB for providing electric power to the microprocessor, the switch, the timer, and the wireless transmitter; the antenna extending externally of the housing; wherein said power source is a compact sized battery; and wherein said switch, said battery, said microprocessor, said wireless transmitter, and said timer are all positioned together to fit within said interior space of said housing unit.