Blue Sea M2 OLED Tank Monitor Model: 1839-BSS Auto-dimming, bright Organic LED display is easy to read 80dB alarm on all models Isolated 500mA MOSFET relay Intuitive tank level monitoring Monitor up to 4 tanks Auto calibration for unique tank shapes Compatible with common sending units The M2 Organic LED Digital Monitor measures essential electrical system parameters with adjustable alarms and an auto-dimming display. The M2 Monitors include a MOSFET External Circuit Relay (ECR) which can be used to control external circuits based on any value measured by the M2. Specifications Meter Tank Function Monitors tank volume in up to 4 tanks Resolution 1% Input Voltage 7-70V DC Alarm/Relay Activation High and Low Level Display Size 55mm x 28mm Range 0.3W-1.0W Tank Alarms 80dB Tank Shapes Custom shapes, auto calibration What’s in the Box: M2 Tank Monitor Display Surface Mount Bezel and Seal Surface Mount Gasket Surface Mount Cover Flat Mount Bezel Flat Mount Clamp Mounting Ring Mounting Nut Connector Screwdriver WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov.