AN/SSQ-53D (3) (PASSIVE SONOBUOYS) Main characteristics of Sonobyoys are as follow: Weight Under 13 Kg Length 914 (+3.575, -4.355) mm Diameter 124 (+0.175, -3.35) mm Power Seawater - Activated Battery Description DIFAR / PASSIVE Acoustic / Frequency 5Hz ~ 2,400Hz Operating Time 0.5, 1, 2, 4, 8 Hours Transmission 0 to 99Ch Frequency Range 136MHz ~ 173.5MHz RF Transmitter Outlet Power 1W minimum Activation Water Temperature (-20°C ~ 55°C) Operating Temperature 0°C ~ 35°C Maximum Release Altitude 30,000ft / 370Knots Operating Depth 30, 50, 120, 300m Shelf Life 05 years in sealed container Show More