Features: 1Wide Application: Suitable for monitoring batteries solar panels model railways RVs motorcycles household batteries motors etc. 22 Color Display: Voltage current display meter with LED red and blue 2 color display red for voltage blue for current clear and intuitive. 3Basic Parameters: The power supply range is DC430V the refreshing rate is about 300ms each time and the working temperature is 1065. 4Function: Digital voltmeter ammeter supports voltage and current testing stable performance high accuracy it is an excellent electrical accessory. 5Simple to Use: Using high quality electronic component materials durable and wear resistant with mounting leads easy to install and disassemble. Specification: Item Type: Voltage Current DisplayMaterial: Electronic ComponentsProduct Size: Approx. 48x29x16mm / 1.9x1.1x0.6inPower Supply Range: DC4-30VRefreshing Speed: About 300ms Every TimeDisplay Color: Red + BlueLead Length: Approx. 15cm / 5.9inWorking Temperature: -10-65 Package List: 1 x Voltage Current Display1 x Shunt2 x Lead Note: 1. The 10A meter head can be directly measured.2. The power supply voltage of the meter must be 4‑30V. If it exceeds 30V an independent power supply is required. Please connect according to the diagram. The four points of the shunt cannot be changed at will.3. Digital display meter and shunt are used together 10A meter head cannot be used with 50A or 100A shunt.4. For meters with a range of 50A or 100A no matter whether the measured current is less than 10A a shunt must be connected to measure the current otherwise the meter head will be burnt.