Feature 1、Practical: The working voltage is 9‑32V, up to 16V, low power consumption, long life, high accuracy, short start up time, the highest depth indication of 100m, you can instantly know the depth of the water. 2、Material: Made of stainless steel 316L bezel and anti fog glass, it has excellent anti fog and waterproof properties, and can be used for a long time even in cold sea environments. 3、Function: This device is work with 12V system only, to indicate the depth appointed. Normally, the buzzer beeps once when it was connected correctly then turn on the power. 4、Mode: Press keypad Mode to switch SH, DP, KL, UN function. Used to turn on or off the monitor. Short press to set the value required, and keep the digital increasing or decreasing fluently. 5、Application: Easy to install, good durability, impact resistant, flexible and easy operation, suitable for yachts, small and medium sized boats, fishing boats and other types of marine transportation. Item Type: Depth Sounder Material: Stainless steel 316L, anti fog glass, ABS Mounting Hole Diameter: Approx. Φ52mm/2in Depth Indication Range: 0-100m/0-328FT Backlight Color: White Operating Voltage: DC 12V Instantaneous Voltage: DC 9-32V, up to 16v Operating Current: 60mA Operating Temperature: -30 °C- + 75 °C Storage Temperature: -40 °C - + 85 °C Dial Waterproof Rating: IP67 Back Cover Waterproof Rating: IP5 Operation: A. This device is work with 12V system only, to indicate the depth appointed. Normally, the buzzer beeps once when it was connected correctly then turn on the power B. Keypad''Mode'': Quick press the keypad''Mode'' to switch SH/DP/KL/ UN Hold the keypad''Mode'' to turn on/off the monitor Short press the keypad''▲''''▼''to set the value required Hold the keypad''▲''''▼''to keep the digital increasing/decreasing fluently. Parameter: SH: (Low level alarm) Range: 0-0.6-19.9, when the level no more than value(SH) appointed,the symbol flickering and the buzzer beeps all the time. If SH=0 -->No alarm Alarm setting range :0.6-19.9 Range: 1). Unit''M'': 0-99 2). Unit''FT'':0-199 3). Unit''F'': 0-49 If the level exceed the a ppointed value , the buzzer will beeps twice Keel offset (KL): Range: 1). Unit''M'': 0-6.0 2). Unit''FT'':0-19.9 3). Unit''F'':0-3.3 Package List 1 x Depth Sounder1 x Transducer (with 10m cable) 2 x Screw 1 x Power Cord 1 x Manual