The Garmin 010-10106-20 8 pin transducer provides accurate depth, speed and temperature readings. Operating frequency of 77/200 kHz; 45/15 degree beamwidth. Compatiable with Garmin echo 100,150,200,300c,500c,550c and echoMap 50s & 70s. Garmin adapter cable 010-11947-00 required when connecting with echo 100, 150, 200, 300c, 500c, 550c.