Specification Display:Big Adjustable High-contrast Dot matrix FSTN LCD 128(V) x 64(H) Display Size: 41 (W) x 48 (D) mm (1.61\' x 1.89\' inch) Backlight: White LED with on/off option Wireless Frequency: 433 MHz 125 kHz sonar frequency Wireless Sensor Coverage:90 degrees beam angle Depth Range Max/Min:131 feet (40 meters)/2 feet (0.7 meters) Wireless operational range:328.08 feet (100 Meters) Water Temperature Indicator in Celsius (C) / Fahrenheit (F) (included in Wireless Sonar Sensor) User selectable meter or feet readings Bottom Contour: Show true changing of water bottom contour Memory: Built-in memory stores sonar setting when the unit is turned off Operating Temperature: -20 ~ 70C (-4 ~ 158F) Waterproof design: IPx4 / Level 4 (Spray Water Proof) Battery life of Wireless Sensor: up to 550 hours in water usage IPX4 Water Resistant Design / Level-4 (spray-water-proof) Controller: 4 x AAA Alkaline Batteries (not included) Wireless: 1 x CR-2032 Button Battery (included) Item size: approx. 136 (L) x 74 (W) x 30 (D) mm (5.35\' x 2.91\' x 1.18\' inch) Item weight: approx. 160g (main unit only)
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