This is a digital voltmeter ammeter with five wires. Two wires are used for power supply and three wires are used for measurement. The product is convenient for you to insert into the built-in circuit of your car, motorcycle, or electric truck. You can monitor the battery voltage at any time. And you can test the current and voltage of other things with it. Features: 100% brand new and high quality. Dual colors blue & red and digital LED display is convenient for you to check. Easy to insert into the built-in circuit of your car, motorcycle, or electric truck. Test the current and voltage of your car, motorcycle, electric truck, and others. Specifications: Operating Voltage: DC 4.5-30V Measuring Voltage: DC 0-100V Minimum Resolution: 0.1V Measuring Current: 10A Item Weight: 19g / 0.67oz Item Size: 4.8 * 3.8 * 2.3cm / 1.89 * 1.5 * 0.9in Package Weight: 55g / 1.94oz Package Size: 12 * 8 * 3cm / 4.72 * 3.15 * 1.18in Package List: 1 * DC 0-100V Voltmeter Ammeter Note: 1. It is unsuitable to use this meter to test current below 1A. 2. If you use it to test ampere below 1A, it will cause great error.