ACR 406 MHz GPS Personal Locator Beacon Smallest, lightest, most function-rich PLB alerts Search and Rescue to your precise location in an emergency. Transmits on 406 MHz (COSPAS-SARSAT) with your registered, unique, digitally-coded distress signal, and 121.5 MHz (SAR homing frequency). Exclusive built-in GPS technology is finely tuned for optimum performance. 100 meter position accuracy when GPS coordinates are present. Easy to activate by novice user, simply deploy antenna to reveal "ON/OFF" activation button, hold for 1 second. Flotation pouch attached to prevent loss if dropped in water, easy to remove from pouch, simply pull down on lanyard. 5-year limited warranty. 5-year replacement life lithium battery. Size: 1.25 x 5.81 x 2.31 in Color: Hi-Viz Yellow Warranty: 5 years Battery Type: Lithium - 5-year replacement life (NON-HAZMAT) Modulation: AM Radiated Power: 5