This product is either discontinued or we cannot get that from suppliers.
Garmin 010-10703-20 Airmar B258, Product type Airmar B258, Frequency 50/200 kHz, Power 1 kW, Beamwidth 14°x23°/3°x5°, Maximum depth 1,500-2,200 ft, Depth/Speed/Temperature Depth and Temperature, Number of pins 8-pin, Cable length 39 ft, Supported deadrise/Transom angles 0°-26° degree deadrise.
This mid-range 1 kW 8-pin transducer with a narrow beam is good for deep water and bottom definition. It has a depth of 1500 to 2200 ft; an operating frequency of 50 to 200 kHz; a beam width of 14×23 to 3×5 deg; and a 0 to 26 deg deadrise.