Specifications: ABS flame retardant material has good electrical properties, high flame retardant and impact strength. Imported high integrated chip, higher precision, more stable. LED display screen, frosted mirror texture, color is consistent, more clear and more beautiful. High frequency low resistance capacitance, low consumption and strong endurance. Item Name: Digital Voltmeter Material: ABS Measuring Range: 4.5V - 30V Power Supply Range: 4.5V - 30V Maximum Input: 30V Permissible Error: &plusmn;0.5 Percent Input Impedance: More than 100K&Omega; Working Current: Red: < 23mA Refresh Rate: About Once Every 300M Display Type: Three 0.56 inch Screen, LED Highlighter Digital Tube Display Color: Red Working Temperature: -20 Degree Celsius - 65 Degree Celsius Features: Mini, Portable, LED Display, Easy to Use Leadwire Length: 20cm/7.87" (Approx.) Boundary Dimension: Length: 48mm/1.89", Width: 29mm/1.14", Height: 22mm/0.87" (Approx.) Hole Size: Length: 46mm/1.81", Width: 27mm/1.06" (Approx.) Notes: Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Digital Voltmeter