Type AN-SSQ-53D Description Passive, directional, low frequency Size A ( Ø 124 mm x 915 mm ) Weight 10 kg Launch Envelope 40 to 30000 feet 0 to 372 Knots IAS Operational Depth 30, 125 and 300 m Operational Life 0.5, 1.0, 2.0, 4.0, 8.0 h (selectable) RF Channels 99 selectable (136 - 173.5 MHz) RF Output Power 1 W Audio Frequencies 5 to 2400 Hz DIFAR