Hydrowave Striper Thumb Expansion Module, Black Hydrowave striper thump expansion module accessory for the Hydrowave H2 or classic marine audio device Finely tuned striper specific sounds ideal for stimulating the larger bites from the bigger stripers in the School The striper thump module comes with 5 exclusive baitfish vs striper sound loops Included sounds: thump, thump frenzy, bait blitz, bait School top, suspend bait School Plug & Play 6 New Sounds Water Proof Construction LRT & VRT Technology Easy to Install