1. Confirm to the standard and rules of technology issued by Register of Fishing Vessel of the Peoples of China. 2. Dual Frequency, Intelligent measurement, Multiple transmit power. 3. High Contrast ratio 10.4-inch color LCD with viewing angles and brightness adjustment. 4. Auto range: Automatically select the range based on water. 5. Auto gain: automatically change based on water. 6. Shallow water alarm to can make sure your safety navigation. 7. Great anti interference function. 8. Zoom & Extension function: Bottom extension mode, Auto zoom mode, Manual zoom mode. Product Specifications Display: 10.4-inch TFT color LCD (640 x480) Basic Range: 0-800m Auto Range: Adjust Range Automatically Auto Gain: Suit for the Water Condition Anti-jamming:Powerful function of anti-jamming Fish Alarm:Adjust menu button to meet your demand Alarm Depth: 0-20m Brightness: Adjustable Brightness Picture Speed: 8-level Adjustable Picture Speed Frequency: 50KHz/200KHz Trans Power:600W-1000W (RMS) Power Supply: DC24V (20%)