Cobra Electronics MF 2500 - Manual (Page 15)

14 Owner's Manual
Transducers
3. TRANSDUCERS
The transducer is a device that transmits and receives sound waves into the
water. The active component inside the transducer is commonly referred to as
an element but actually is a piezoelectric ceramic material.
CobraMarine
TM sells 4 transducers for various applications. See the table
below
.