["Features:\r\nThis voltmeter's wiring is simple, it only need to connect two wires, the red wire is to connected to positive pole, the black wire is to connected to negative pole, There is for protection when the wires aren'for t correctly connected, the electric circuit won'for t be bumed\r\nThis voltmeter doesn'for t need external drive working power, it can work with measuring voltage, the working voltage's range is 4.5-30V\r\nToreach the best measurement accuracy, this voltmeter will automatically move the decimal point's position according to the different measuring voltage, When it measures the voltage below 10V, it will display two places after decimal point, when it measures the voltage above 10V, it will display one place after decimal point\r\nThis voltmeter can be used to measure the storage battery's voltage in motorcycles and for cars and also can grasp the storage battery's status, It also can be used to measure other voltage\r\n\r\nNote:\r\n30V is the voltmeter's maximum operating limited voltage, please leave enough margin when working, to avoid voltmeter's permanent damage because of electrical spark, power supply ripple, or other too high abrupt change of voltage\r\nThis voltmeter didn'for t do moisture-proof, waterproof, shockproof, anti-oil processing, please be careful or handle by yourself when using\r\n\r\nSpecifications:\r\nMeasuring range: 4.5V-30V DC\r\nMinimum Input: for DC 4.5V\r\nMaximum Input: for DC 30V\r\nAccuracy: 1%(+/- 1word)\r\nDisplay Type: 3 0.36\" LED tube\r\nDisplay Color: Red/Blue/Green\r\nRefresh speed: About 200ms/time\r\nCurrent consumption: less than 20mA, usually 5-15mA\r\nWorking temperature: -10℃~65℃\r\nDimensions: 34x23x17mm/1.34x0.91x0.67\" (LxWxT)\r\nOpening Size: 30x20mm/1.18x0.79\"\r\nQuantity: 1 Pc\r\n\r\nNote:\r\nPlease allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid\r\nDue to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!\r\n\r\nPackage Includes:\r\n 1 x Digital LED Display Voltmeter"]