ITEM NAME:3 Wire Green LED Digital Display Voltage Meter Voltmeter Car Motor 0.56'' Description: - Reverse connect protection. - Measuring range: DC 0.00V--30.0V. - Power Supply: DC 3.00V- 30.0V - Accuracy:  ±1%. (when ≠¥10V,  ±0.3V; when<10V,  ±0.1V) - Input impedance: > 100KÃŽ © - Max Working Current: 18mA - Refresh rate: about 300mS / times. - Display: 0.56 "dual 3 digital tube. - Operating Temperature: -10 °C - 65 °C Specification: - Material: PCB - LED Color: Green - Size: Approx. 48x 29x 22mm/ 1.89x 1.14x 0.87inch - Open Hole: Approx. 46x 27mm/ 1.81x 1.06inch Package Included: 1 Piece 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..Input impedance: > 100KÃŽ ©. - Display: 0.56 "dual 3 digital tube. - LED Color: Green. Due to the light and screen setting difference, the item's color may be slightly different from the pictures. - Max Working Current: 18mA.