. Features: Car Motorcycle LED Digital Display Voltmeter Measures for DC voltage 6-30V Low voltage (12v or less) and high voltage (16v or higher) flashing warning function Can quickly and intuitively judge the state of the battery and the working state of the generator Simple to connect and easy to use.Ultra-thin, mini & lightweight Widely used for cars, motorcycles, substation automation, distribution automation, test equipment, voltage regulator and so on. for Time setting instructions: 1. In the power supply state, after pressing the button for 2 seconds, the hour segment flashes, indicating that the hour setting is entered. At this for time, press the button once for 1 hour (24-hour clock). 2. After the clock is set, press and hold the button again for 2 seconds, the minute segment flashes, indicating that the minute setting is entered. At this for time, press the button once for 1 minute. 3. After setting the minutes, press and hold the button again for 2 seconds to exit the for time setting. Specifications: Product Function:Voltmeter + Electronic Clock LED Display Color: Red, Blue, Green, White Material: Acrylic Voltage Measuring Range: 6-30V Precision: 0.2% Size: Length: 5.7cm(2.24in) ,Wide: 2.9cm(1.14in) Wire Length: About 120cm Quantity: 1 Set Note: 1.Transition: 1cm=10mm=0.39inch 2.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 3.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes:(No retail package) 1 x Voltmeter 2 x Cable Tie 2 x Screws