Order Number SNT00065The Model ET-1B (emergency transmitter) is one of the smallest portable signaling units in the Linear family of wireless security products. Measuring only 1.5 by .75 inches, the ET-1B can be worn on the supplied lanyard or attached to a keyring. The transmitter is supplied with an adjustable lanyard with a breakaway release. When activated by pressing both buttons, the ET-1B sends an alarm signal to a companion receiver. The two-button feature provides protection against false alarms. WARNING: Both buttons must be pressed for a minimum of two seconds to cause receiver activation.