“My Mr.Crappie HydroWave Mini is ‘The Unit’ to attach on docks to keep crappie and baitfish present. My Mr.Crappie HydroWave Mini unit is perfect for small craft... keeps baitfish under your boat at all times!” — Wally Marshall Preloaded with two signature Mr.Crappie sound loops, the Hydrowave Mini is powered only by a 9-Volt battery (not included), and lasts up to 6-8 hours on a single charge. Shock and Water-Resistant just like the original, you can control the volume, and play or pause sounds easily and conveniently from the head. The speaker is also attached by an 8ft cable for maximum reach. Delivering a whole new level of versatility, make the most of your fishing time with the new, portable Hydrowave Mini Marine Audio Device. What's in the Box: -Mr. Crappie HydroWave Mini -User Guide and Warranty Card