The probe is installed on the hull and needs to be submerged in water Use a pole to guide the sonar sensor to a desirable position or add floats on the cable to float on the water. The float can be removed as follows, If you do not need it, cutting off the rubber stopper from the cable and sliding the safety strap and the float towards the plug and gently take it out from the plug SUITABLE FOR MULTIPLE WATER BODIES High sonar scanning frequency/precise detection FIND FISH IN LAKES, PONDS AND RIVERS. CAST FROM DOCK, SHORE, BANK OR KAYAK. View water depth, through a receiver Hign-concerned Chemical:None Display:2inch TN/ANTI-UV LCD Depth Capability:328feet(100m) Waterproof design:level-4 (-water-proof) Sonar Coverage:45degrees beam angle in 200Khz (The product printed words depending on the batch, but this does not affect use) Color:As Shown Material:plastic Package Contents: 1 * Fish Finder Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.