ACR ResQLink AIS GPS Personal Location Beacon PLB 450 w AIS RLS [2933] Maritime Thermal Monitoring System Box Dimensions: 9"H x 10"W Add Pullback Bar:1" x 6" Rubber W Add Pullback Bar Box Dimensions: 9"H x 10"W x 11"L WT: 3 durable design ensures reliable operation in challenging environments The addition of AIS (Automatic Identification System) transmissions means the ResQLink AIS simultaneously alerts all vessels equipped with AIS transponders within the VHF radio range of the PLB’s distress position The Worldwide Cospas Sarsat satellite system includes 3 different constellations to ensure your 406 MHz distress signal immediately reaches the global network of Search and Rescue forces with your location accurate to within 100 meters