Sonic Depth Finder with the wired transducer is more effective in some conditions as a beam angle gets narrower by 45 degrees and scanning depth increases to 100 meters.! Suitable for NIGHT & DAY FISHING. More contrast and obvious display at nights compared with the other Lucky models. Wide Applications: Turbid Water, Reservoir, Sea, River, Lake, Boat Fishing, Ice fishing, Kayak fishing How to use the Sonar Sensor: 1. Toss the sensor and float into the water(Place the sensor and float in your hand, and toss underhand); 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. Features : Fluorescent Backlight in Dark Environment Turbid Water Detection Material: ABS Waterproof Design: Level 4 (spray-waterproof) Sensitivity Setting Battery Strength Indicator Water Depth Indicator Fish Depth Signal Fish Alarm ON/OFF Battery Save ON/OFF Fish Icon Anti-Clutter Specifications: Measure Units: Meters / Feet Display: 2 inch TN/Anti-UV LCD display Transducer Sensor: 4.6cm (46mm) diameter Round shape with 7.5m (25ft) cable Depth Range: Max: 100 m (328.08 ft) Min: 0.7 m (2.30 ft) Sensor Beam Angle: 45 degrees Sonar Frequency: 200Khz Operating Temperature: -10°C to 50°C Uses 4 x AAA batteries (not included) Set Includes: 1 x Fish Finder 1 x 4.6 cm or 46 mm Diameter Round Sonar Sensor with 7.4 m Cable 1 x Bolt 1 x Wing Nut 1 x Neck Strap Print colored retail box