Description The item is a DC4-30V 0-10A accurate micro LED digitalVoltmeterboard module. It is a good tool for you to detect and display Voltmeter. Features - Display Color : Blue - Cable length: 19 cm - Dimensions: 35 * 18 * 9 mm - Measuring range: DC 0 - 10 A - Supply range: 4 - 30 V - Dimensions: 35 * 18 * 9 mm - Cable length: 19 cm - Measuring range: DC 0 - 10 A - Supply range: 4 - 30 V - Equipped with no shell - Electric wire: Power input: Thick white wire Voltmeter output: Thick black cable Supply positive pole: Red wire Supply negative pole: Black cable Note - The measuring instrument is operated from the measured circuit, so it is done: His thick black cable is the wire. The thick white cable should be connected with the input of the Strengtheningcircuit. - The thick cable not allowed to be connected to the positive terminal of the device, otherwise seem any scratching or error , you just have to connect to the negative terminal. - Please do not use a power adapter of poor quality. - Connection cable between Voltmeter meter should not be too long, otherwise you need shielded cable. Package list: 1 x Accurate Micro LED Digital Voltmeter Board Module DC4-30V 0-10A Voltmeter Monitor Voltmeter Display Panel Meter (White Letter)