[BM3618] Function: This is an amazing product, specially designed for amateur and professional fishermen. It can find out the fish's position, water depth and bottom contour. The new model supports the distinction between big fish and small fish. Suitable: The fish finder can be used in the ocean, river or lake, very suitable for detecting fish schools in any specific area. It can detect the specific position and quantity of the fish school to improve fishing efficiency. Data: The depth detection range of the fish finder is 0.6 to 100 meters, and the water depth accuracy is 0.1 meters. Operating temperature range: minus 20 degrees -70 degrees. Sensor installation method: 1. Fix it on the hull; 2. Use a float on the cable to submerge the sensor into the water; 3. Fix it on the pole and push it into a suitable position in the water; 4. Cut a hole on the ice , Place the sensor underwater. Display: The LCD screen is backlit to display the detection data. You can see the density of underwater fish, as well as the conditions of water plants and rocks. Note: The product does not include batteries, users need to prepare 4-AAA alkaline batteries. Product Features: Simulate the demo mode to facilitate users to understand how to use LCD display The depth detection range is 0.6~100 meters, and the water depth accuracy is 0.1 meters User-defined measurement unit: meters or feet Light green screen backlight Battery saving mode High/low sensitivity setting Fish position depth scale Probe: can be used floating on water or installed on the ship's side 45 degree probe detection angle 4 AAA batteries, but not included in the item IPX4 waterproof design Cable length: 12 meters Dimension: 120*65*30mm Net weight: 173g Package weight: 580g Note: The product does not include batteries, users need to prepare 4-AAA alkaline batteries.