Display: big adjustable high-contrast Dot matrix FSTN LCD 128(V) x 64(H) Backlight: white LED with on/off option 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:230 feet (70 Meters) Water temperature indicator in Celsius / Fahrenheit (included in Wireless Sonar Sensor) User selectable meter or feet readings Bottom contour: show true changing of water contour Memory: built-in memory stores sonar setting when the unit is turned off Operating remperature: -20 ~ 70°C (-4 ~ 158°F) Waterproof design: IPx4 / Level 4 (Spray Water Proof) Battery life of wireless sensor: up to 550 hours in water usage