Abstract: The present invention provides a complete, easy to use and install security and surveillance system for a personal computer, which is designed to act as a peripheral to the personal computer. The system utilizes a radio frequency device having receiving and transmitting means connected between the serial port of the personal computer and various sensors to input signals to the non-data pins of the serial port whereby software in the personal computer interprets the signals received at the non-data pins to place a call to a pager or cellular phone, or communicate with another computer, produce sound effects, and/or operate video equipment.