["Description:\r\n brand new,high quality\r\n\r\nSpecifications:\r\nBasic performance parameters:\r\nDisplay color: blue\r\nVoltage measurement accuracy: 1%\r\nPower resolution: 1%\r\nSupply voltage: DC4.0-30V\r\nVoltage measurement range: DC0-150V\r\nDimensions: height 15mm/0.59in, outer diameter 25mm/0.98, mounting opening 22mm/0.87in\r\nWiring method: 2-wire or 3-wire automatic identification\r\nColor: White\r\nQuantity: 1 Pc\r\nSuitable for all kinds of batteries, the buttons can be set, and the alarm value can be set.\r\n\r\nWiring instructions:\r\nWiring method: 2-wire mode Measuring range 4-30v\r\n- Connect the battery negative, + connect the battery positive, V+ dangling\r\nWiring method: 3-wire mode Measuring range 0-150v\r\n- Connect the battery negative pole, + Connect the power supply positive pole (4-30v), V+ to the total positive pole\r\nSize Description: The opening is 22mm and can be glued and reinforced. The surface is rainproof\r\n\r\nNote:\r\nTransition: 1cm=10mm=0.39inch.\r\nThe voltage and percentage are linearly related. U-L corresponds to 0% of power, U-H corresponds to of power\r\nPlease allow 0-1cm 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\n1 x Digital Voltage Battery Power Indicator (The default 12V lead acid)\r\n\r\n\r\n\r\nAbout model selection:\r\n[Factory default second-line lead acid 12v] You can use it directly on lead-acid 12V when you get it. If you use it in other batteries, please reset U-L (undervoltage) and U-H (full charge).\r\nMore settings are as follows.\r\nFor changes, please refer to the following method:\r\n1. There is a white high button on the back of the board. Press the button for 3 seconds to display 1-U, release the button, press 1 second to display UL, release the button, press 1 second to display UH, release The button, press 1 second. Display 4-d;\r\nSecond, when displaying 1-U, press the button for 3 seconds, you can fine-tune the voltage measurement. At this for time, release the button and press it again. The voltage will be fine-tuned upwards. Press and hold again, And then fine-tune it. You can adjust it repeatedly. Wait for the screen. Automatically save and exit after flashing; generally no need to correct\r\nThe value is added, the stop is pressed and Then the button is pressed, the value is reduced, and the adjustment can be repeated after the screen is blinking. Automatically save and exit. This voltage value corresponds to 0% of the power.\r\nAt the for time, release the button and press it again. The value is added, the stop is pressed and then The long press, the value is reduced , and the adjustment can be repeated after the screen flickers. Automatically save and exit. This voltage value corresponds to of the power\r\n5. When 4-d is displayed, the display mode can be adjusted, and the long press can change the value. V is the voltage mode, % is the percentage mode, and the V% voltage and percentage cycle are displayed.\r\n6. When 5-L is displayed, the power alarm value can be adjusted. At this for time, release the button and press and hold again. The value is added, the stop is pressed and then long pressed, the value is reduced, and The adjustment is be repeated repeatedly. After the screen flickers, it will automatically save and exit. The default is 10%. When the battery level is lower than this value, the alarm will flash.\r\n7. After each adjustment value is set, wait until the screen flashes automatically to save and exit before proceeding to the next operation, otherwise the new adjustment value will not be saved!\r\nSetting example: Set up a battery-powered system. The lowest alarm voltage is 21v. The full voltage is 27.5V. The display mode is only showing the percentage.\r\nSet as follows: select 21V in U-L, 27.5V in U-H, and % in 4-d;\r\n\r\n Frequently Asked Questions: (Q & A)\r\n1 : Power percentage and voltage Do you want to switch manually?\r\nA: The default power percentage and voltage values ​​are automatically displayed in turns and displayed in 2 second intervals. Users can also set their own fixed display one.\r\n \r\n2 : I don'for t know how much my lithium battery is. How to buy it\r\nA: Lithium batteries are generally divided into two kinds of lithium batteries: 3.7V/3.2v.\r\nLithium in the option is the default 3.7v (full charge is 4.2v) lithium battery. Look at the maximum output voltage of the charger/4.2V to get the number of strings. For example, the charger writes a maximum output of 54.6v. 54.6v/4.2V=13 strings. 12.6V/4.2v=3 strings. Lithium-free parallel connection.\r\n3.2V lithium battery (full charge 3.6v). For example, the maximum output of the charger is 14.4v. 14.4/3.6v=4 strings. For 3.2v lithium battery, customers need to set it up.\r\n \r\n3: I don'for t know my battery U-L, U-H is how much v.\r\nA: The general