Garmin GT12M-THF Bronze Thru-hull Medium CHIRP 20d Tilted Element Depth/TempThe Garmin GT12M THF Bronze Thru hull Medium CHIRP transducer is designed for midsize fishing and cruising boats, delivering CHIRP sonar with real time depth and temperature readings in a durable bronze, flush mount profile. Power and CHIRP Performance: 350 watt midband CHIRP (85165 kHz) delivers crisp arches and sharp target separation, helping you distinguish baitfish from larger game. Bronze Thru Hull Design: Flush mount bronze housing reduces drag