Airmar
Airmar B765C Low High CHIRP with Mix-N-Match PlugModel: B765C-LH-MMDepth & fast-response water-temperature sensorLow—CHIRPS from 40 kHz to 75 kHz, 32° to 21° beamwidthHigh—CHIRPS from 130 kHz to 210 kHz, 15° to 9° beamwidth115 kHz of total bandwidth...