Compare the specs, why pay more and get less? In key areas the BL200 outperforms, depth range, ping rate, battery swap ability and Sound Velocity Adjustment. BL200 Sonarmite transducer housing stainless steel plastic Frequency 200khz 233khz depth range .5m-100m .5m-75m accuracy – 0.01 m +/- 0.1% depth – 0.01 m +/- 0.1% depth Beam width 9 degree 9 degree ping rate output 1-10 per second adjustable 2 per second non adjust SV adjustment increments of 1 1350-1650 increments of 10 Battery swapping YES NO Cost $2999.95 $7000.00