["Feature:\nLED lead acid battery BMS capacity indicator voltage meter.\nCan display the battery voltage, battery power, you can also plug directly into the phone or the 5V equipment charging.\nSuitable for all kinds of outdoor power, mobile power, instrumentation and other equipment additional battery power voltage display and additional USB to charge the phone and other functions.\nUses synchronous rectification step-down chip scheme, with little heat, energy saving and environmental for protection.\nSmall size and light weight.\nFine workmanship and good performance.\nEasy to read, Easy to use, Durable in use\n\nSpecification:\nOpening Size: approx. 45*26*18mm\nUSB Output 5V/2A(max), two USB port total is 2A\nThe accuracy of the voltmeter is about 2%\nWorking Temperature: -10~+65℃\nWorking Humidity: 10-80% (no condensation)\n\n12V lead acid voltage range: (4 series of lithium iron phosphate batteries can be used)\nBattery voltage is greater than 10.3V + -2%, showing 10% power\nBattery voltage is greater than 10.6V + -2%, showing 20% power\nBattery voltage is greater than 10.8V + -2%, showing 30% power\nBattery voltage is greater than 11.3V + -2%, showing 40% power\nBattery voltage is greater than 11.6V + -2%, showing 50% power\nBattery voltage is greater than 12.1V + -2%, showing 60% power\nBattery voltage is greater than 12.3V + -2%, showing 70% power\nBattery voltage is greater than 12.6V + -2%, showing 80% power\nBattery voltage is greater than 12.9V + -2%, showing 90% power\nBattery voltage is greater than 13.2V + -2%, showing power\n\nPackage included:\n1 * 12V Lead Acid Battery Capacity Indicator"]