Abstract: A circuit for controlling electric load(s) includes two smart switches connected in a three-way circuit configuration. Each of the two smart switches includes a first and second input terminals configured to receive an AC power. The switch also includes a first and second output terminals configured to provide the AC power to an electric load, and further includes a relay configured to selectively couple the first input terminal to the first output terminal or the second output terminal, and a controller configured to control the coupling of the relay. The switch includes a first AC/DC converter and a second AC/DC converter. The first and second AC/DC converters are configured to selectively receive the AC power from the corresponding first or second output terminal that is selectively coupled with the first input terminal and to provide a DC power to the controller.

Abstract: A security monitoring system includes a sensor and a magnetic base. The sensor may include a ferromagnetic convex cover. The magnetic base may include a concave surface. The sensor is configured to be magnetically releasably mounted onto the magnetic base by constructing the convex cover of the sensor to snug with the concave surface of the magnetic base.

Abstract: A security monitoring system includes a sensor and a magnetic bracket. The sensor may include a ferromagnetic convex cover. The magnetic bracket may include a concave surface. The sensor is configured to be magnetically releasably mounted onto the magnetic bracket by constructing the convex cover of the sensor to snug with the concave surface of the magnetic bracket.