Feature: 1. Main Function: This color digital fish finder determines the distance between its transducer and underwater objects such as fish, lake bottom or seabed, and displays the results on a 7in color screen. 2. Basic Scope: With multiple basic scope, Meter: 5, 10, 20, 40, 80, 150, 300, 600, 1000; Feet: 15, 30, 60, 120, 200, 400, 1000, 2000, 3000; Fathom: 3, 5, 10, 20, 40, 80, 150, 300, 600; Passi Braza: 3, 5, 10, 30, 50, 100, 200, 350, 600, can be changed on system menu. 3. Depth Detection: Utilizing the fact that ultrasonic waves travel through water, traveling at an almost constant speed of 4,800 feet (1,500 meters) per second. The depth of an object can be determined by calculating the time difference between the transmission of sound waves and the reception of reflected sound waves. 4. High Performance: The electrical signal generated by the transmitter is converted into an ultrasonic signal by the transducer. Any reflected signal from an intermediate object (such as a school of fish) is received by the transducer and converted into an electrical signal. It is then enlarged in the amplifier section and finally displayed on the screen. 5. Color Display: The picture displayed by the color digital fish finder is composed of a series of vertical scan lines, each scan line representing a snapshot that took place under the boat. A series of snapshots are accumulated side by side across the screen, and the resulting contours is displayed. Specification: Item Type: Fish Finder Material: ABS + Metal Screen: 7in color TFT LCD Background Color: Optional: Blue, Light Blue, White and Black Basic Scope: Meter: 5, 10, 20, 40, 80, 150, 300, 600, 1000 Feet: 15, 30, 60, 120, 200, 400, 1000, 2000, 3000 Fathom: 3, 5, 10, 20, 40, 80, 150, 300, 600 Passi Braza: 3, 5, 10, 30, 50, 100, 200, 350, 600 (base range can be changed on system menu) Range Conversion: Up to 1000 meters (3000 feet, 600 fathoms, 600 passi/braza) Zoom Range: Times 2, 3, 4 and 6 ranges Bottom Lock Extended Range: 5 10 20 meters, 10 20 40 feet, 2 5 10 fathoms, 2 5 10 passi/braza Auto Mode: Automatically adjusts range and gain Display Modes: High (200K), Low (50K), Dual (200K and 50K 1/2 display each), Zoom (200K and 50K zoom), and A frame display Zoom Display: Marker Zoom, Bottom Zoom and Bottom Locked Expand Show forward speed: Line/TX: Freeze, 1/8, 1/4, 1/2, 1/1, 2/1, 4/1 Transmit Frequency: 50 and 200 kHz (alternate transmission) Power Output: 600W RMS Interference Suppressor: Rejects unwanted signals by comparing the strength of the last and current signal. Alarm: Fish bottom alarm, temperature alarm (requires sensor) NMEA0183 Support: Input: RMC, VTG, HEV Output: SDDBS, SDDBT, SDDPT POWAB Only the hardness is output in ONWA format SDSBH Only hardness output ONWA format PHDX Only output hardness in HONDEX format PKODS Only hardness output KODEN format Power Supply: 12-24 VDC ( -10%, +30% ): 1.0 – 0.6 A Ambient Temperature: 0℃ to +50℃ Relative Humidity: 85% at 40℃ Vibration: ± 1mm ±10%, 2(5) to 13.2 Hz, Maximum Acceleration: 7m/s^2, 13.2 to 100 Hz Waterproof: Display unit (front panel): IPX7. Package List: 1 x Fish Finder1 x Lid1 x Base2 x Mounting accessories1 x Pack of Accessories (13PCS)1 x Wire harness3 x Instruction manual