This product is either discontinued or we cannot get that from suppliers.
Garmin 010-11928-20 Airmar TM150M, Frequency: CHIRP Mid (95-155 kHz), Power: 300 W, Beamwidth: 26°/17°, Maximum depth: 600 ft., Depth/Speed/Temperature: Depth and Temperature, Number of pins: 8-pin, Cable length: 33 ft., Supported deadrise/Transom angles: 3°-20° degree transom.
This 300 W plastic transom mount with CHIRP technology has a maximum depth of 1,500 ft; an operating frequency of 95 to 155 kHz; a beamwidth of 26/17 degrees; and mounts on a 3 to 20 degree transom.