ITEM NAME:3-Wire mini DC 0-100V voltmeter LED panel 3-digital display voltage JR Description: Three wires digital voltmeter, mini size, with reversal protection, and connect easily. Measure Voltage Range: DC0-100V. Min Input Voltage: DC4V Max Input Voltage: DC40V Measurement Accuracy: 1% (+ / - 1 digit) Display: Three digit 0.28" LED Display Color: Yellow Refresh Rate: about 100mS / times Power Supply: No need other power supply Operating Temperature: -10Â °C - 65Â °C Size: 2.2cm x 1cm (0.87''*0.394'') Mounting Hole Center Distance: 28mm Screw Size: M2.0 x 12(This item NOT included) Some applications: Measure 18650 batteries Measure Cell-phone Lithium Batteries Measure Nickel-hydride Battery Pack Measure Cars Motorcycles Battery Voltage Etc. Package included:1 x Three Wires DC0-100V Digital Voltmeter Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement..Display: Three digit 0.28" LED. Display Color: Yellow. Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Screw Size: M2.0 x 12(This item NOT included).