This is a digital voltmeter ammeter with five wires. Two wires are used for power supply and three wires are used for measure. The product is convenient for you to insert into the built-in circuit of the car, motorcycle or electric truck. You can monitor the condition of 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. Double colors blue & red and digital LED display are convenient for you to check. Easy to insert into the built-in circuit of the car, motorcycle or electric truck. Test the current and voltage of the car, motorcycle, electric truck and something else. Specifications: Operating voltage: DC 4.5-30V Measure voltage: DC 0-100V Minimum resolution: 0.1V Measure current: 10A Item weight: 19g / 0.67oz Item size: 4.8 * 3.8 * 2.3cm / 1.89 * 1.5 * 0.9in Package weight: 21g / 0.74oz 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 less than 1A. 2.If you use it to test ampere below 1A, it will cause big error.