The Model ET-2 Miniature Transmitter is a battery powered, portable, miniature pendant transmitter designed for use with Linear's Standard Digital Format receivers. The transmitter can be used in a limitless number of wireless remote control applications. Pressing the button on the transmitter sends a digitally coded wireless signal to its companion receiver. The ET-2 is a one-button, one-code transmitter. The transmitter button has a positive click feel. Press the button for a minimum of two seconds to insure receiver activation. The ET-2 transmitter is powered from a 12-Volt Type GP-23 battery with an expected battery life of about 1 year. The red test/operate indicator lights during operation. When the transmitter does not function, or its range decreases, replace the battery. A detachable 30" neck chain is provided with each transmitter.