Designed for pilots and aircrews, the Breitling Emergency is an instrument watch with built-in micro-transmitter broadcasting on the 121.5 MHz aircraft emergency frequency. Following a crash or a forced landing, for example, the Emergency will broadcast a signal on which rescuers can home in. The watch thus serves as a complement to the aircraft’s own distress signaling equipment. The Emergency’s transmitter is activated by unscrewing a protective cap and pulling the antenna out fully. It will then broadcast for 48 hours. Over flat terrain or calm seas, the transmitter’s signal on the 121.5 MHz aircraft emergency frequency has a range of about 160 kilometers (100 miles) assuming the search aircraft is flying at 6,000 m (about 20,000 feet).