Features: Simple & easy- for assemble by yourself. Designed with non-touch detection current without disconnecting wires. Wireless transmission, which can avoid the complex wiring between the display and detection modules to bring interference. Voltage, current, power, capacity, percentage of remaining capacity, running-time is displayed for at the same time-. Suitable for electric vehicle modification, RV- assembly, battery inspection and photovoltaic system. Specifications: Material: plastic+metal LCD-size: approx 86x53x17mm/3.4x2x0.7-inch Style: 50A/100A/200A/300A/500A(optional) Note: Please allow 1-3cm error due to manual measurement. please make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1 Set Ammeter Voltmeter