JW Fishers Multifrequency Transponder Housing:Very Long Duration Housing The SEF coil technology provides

The SEF coil technology provides stable operation

Both models are submersible up to 250 feet

Vibration - When this feature is active

An optional rechargeable battery kit is available

Stabilizes the M-Scope metal detector

JW Fishers Multifrequency Transponder Housing:Very Long Duration Housing The SEF coil technology providesJW Fishers SLFP 1 Low Frequency Pinger Acoustic pingers are devices that generate acoustic signals underwater. They are used to mark an underwater site or piece of equipment so a returning diver, using a pinger receiver, can locate the exact spot. Pingers are available with different transmit frequencies so several can be deployed in the same general area without interference from each other. The diver adjusts his pinger receiver to the frequency of