Solu &reg;Dc4.5-30v Two Wires Digital Voltmeter 0.36" LED Display//0.36 Inches Blue LED 4.50-30.00v Dc Digital Voltmeter Measure Voltage Panel Meter//mini 0.36" 3 Digital LED Display Dc 4.5-30v Blue Volt Voltage Meter Voltmeter About us (Solu ), Professional factory of circuit boards for Arduino, welcome to our store for more choices with best price. What we pursue is your satisfication of our service, not just for our goods.For any reason you are unsatisfied with our product at any time, simply contact support for exchange or refund. we will reply you about any question you ask within 24 hours Measure Voltage Range: DC4.5-30V. When the voltage lower than 4.5V, the brightness of the LED display is dimmed, but does not affect the correct measurement. Usually, you will get it actually in 9~19 days, If you are in the USA and the item is NOT Fulfilled by Amazon. the item will be sent to you by USPS with shipping information from China. The estimated delivery time offered by Amazon is not the real time. Your patience is highly appreciated. Hope you will receive your item soon and enjoy using it. Measurement Accuracy:1% (+ / - 1 digit) Display: Three digit 0.36 Max Input Voltage: DC30V