Features Wide Voltage Detection Range: Accurately measures DC voltage from 2.4V to 30V with automatic decimal point shifting for easy reading Simple Two-Wire Connection: Easily connects to the positive and negative terminals, making setup quick and hassle-free for users of all skill levels No External Power Required: Operates directly from the measured voltage, ensuring convenience and eliminating the need for additional power sources High Precision with Protection: Features reverse connection protection for enhanced safety and reliability, providing peace of mind during use Compact and Standard Size: The 0.36-inch design fits standard installations, making it a perfect choice for various applications and spaces Features: 1、There are 5 colors of light to show the measuring voltages: Blue, Yellow, White, Red, Green. 2、Detecting voltage range DC 2.4V-30V, the decimal point is automatically shifted. 3、Easy to use: Just connect two wires of this mini voltmeter to the negative and positive pole of measured voltage. 4、High precision, reverse connection protection. 5、International standard size, convenient installation. Specification: Features: There are 5 colors of light to show the measuring voltages: Blue, Yellow, White, Red, Green. Detecting voltage range DC 2.4V-30V, the decimal point is automatically shifted. Easy to use: Just connect two wires of this mini voltmeter to the negative and positive pole of measured voltage. High precision, reverse connection protection. International standard size, convenient installation. Specification: Working voltage: DC 2.4-30V Measuring range: DC 2.4-30V Installation opening: 23*14.5mm / 0.9*0.6in Working temperature: -10~ +65℃ Working humidity: 10~80%RH (no condensation) Working prure: 80~106KPa Dimensions: 33*15*10mm / 1.3*0.6*0.4in Package list: 5 x Mini Voltmeter Package List