All New Venterior Portable Fish Finder is eligible for a 2-year Warranty provided by the brand support.How to use the Sonar Sensor: 1. Toss the sensor and float into the water. 2. Attach the Side-Scan Adapter to the boat hull using the mounting tabs. 3. Attach the sensor to a handle, lower the sensor into the water.Attention: 1. It will turn off automatically if the depth display reads "---" continuously for 5 minutes. 2. When use this fish finder on moving boat, please make sure the bottom of the transducer is horizontal and the moving speed is slowly (lower than 5 mph). 3. Strong waves, suspended matter and muddy water,will affect the performance.4. Its reading might be interfered with other high power sonar fish finder close to your fish finder. Please make sure there is no other sonar fish finder cloes to your fish finder.