Abstract: A stand-alone alert device that monitors electrical inputs from a third party sensor and alerts a user of a condition change via a cell phone or embedded transmitter. Typical inputs are one or more switches or environmental sensors of various types. User accessible settings allow configuring the device for different sensor output types. The device may also be set to make daily calls at a specific time to indicate device integrity. Power for the control circuit and the cell phone or embedded transmitter may be supplied via a battery pack when connection to public power is not desired or possible. By employing battery power, a flexible sensor interface and cellular telephony, the device enables simple and low cost monitoring in remote, mobile, temporary, clandestine or otherwise restrictive circumstances.