Personal Locator Beacon MicroPLB High-Reliability Bright Yellow 4.75" x 2.3" x 1.1" CLASS II 48 Hour minimum PLB (-20C to +55C) [we test 100% to -30C to +60C] - transmits a 5W 406MHz satellite signal and a 121.5MHz homing signal for on-scene closure with search and rescue forces; uses an internal GPS receiver and self-calibrates to current GPS constellation status before transmitting GPS coordinates accurate to less than 10 meters Very easy to activate under extreme survival conditions - with one hand - even with gloves on in the dark and wet/cold - power on/off pin for battery preservation - with self test capability Works 24/7/365 anywhere on the planet - real-world operationally proven to save lives - very rugged, waterproof, dust proof Lithium (Li/MnO2) battery is US DOT approved for all common carrier - carry aboard aircraft in carry-on luggage NO service or subscription fees of any kind - easy owner registration on-line - five (5) year manufacturer's warranty (parts and labor) against manufacturing defects or materiel defects under normal handling and operations