A frequency synthesizer includes: a phase detector, a loop filter, a controllable oscillator, a frequency divider, and a sigma-delta modulator for providing the division factor according to an integral part and a fractional part. A handle carries a filter that can be accessed and cleaned, even with a full reservoir, by closing a fluid stop valve and releasing the handle. A procedure to match location and type information of electric devices to a two-Dimensional or three-Dimensional map of the home may be automated.