The smallest PLB available. Quickly alert search and rescue to your location if seriously injured. With built in GPS the Microfix will transmit your coordinates (within 100 m) via satellite to search and rescue. Also transmits 121.5 MHz homing signal. Waterproof to 16 ft (does not float). Great for backpackers and those tight on space. Transmits for a minimum of 24 hrs. at -20° C (longer at higher temp.). Size: 1.4" x 5.85" x 2.21". Wt: 9.98 oz.