Smart Battery Monitor 1.8in Display Waterproof BT Multifunctional Battery Monitor with Shunt for RV Boat 50A 10‑100V Item Type: Smart Battery Monitor Material: ABS, Stainless Steel, Silicone Screen Size: Approx. 1.8 inches / 4.57cm Sampling Method: Shunt Voltage Testing Range: Approx. 10-100V Voltage Resolution: Approx. 0.01V Current Measurement Range: Approx. 0-50A Current Resolution: Approx. 0.001A Capacity Display Range: Approx. 0%-100 percent Power Measurement Range: Approx. 0-5KW Power Resolution: Approx. 0.01W Ah Measurement Range: Approx. 0-9999AH Capacity Resolution: Approx. 0.1AH BT Communicate Distance: Approx. 10m / 32.81ft unobstructed Voltage Accuracy: ±1%+2 digits Current Accuracy: ±2%+0.002A Display Power Consumption: Approx. 0.75W Screen Off Time: 20 seconds auto off during charging; screen on when I≥15ma, off when I<15ma and >20s