Hydrowave Bait Fish Expansion Module, Black HydroWave Bait Fish Expansion Module accessory for the HydroWave H2 or Classic Marine Audio Device Allows the angler to create an active environment by using the Baitfish Expansion module to liven things up The Hydrowave Bait Fish Expansion Module contains six exclusive sound loops Included Sounds: Shad Blitz, Shad Spawn, Bait Ball, Shad Eruption, Spawn Frenzy, Suspended Bait Plug & Play 6 New Sounds Water Proof Construction LRT & VRT Technology Easy to Install