Features: 1.This is a LED display digital DC voltage meter.               2.Portable and lightweight,easy to carry. 3.Many colors display optional. 4.It has reverse connection protection,reverse connection does not burn. 4.LED display,easy to read at night. Descriptions: This is a digital display DC voltage meter for car,motorcycle,battery cart,ship etc. Specification: Display color: (optional) 2 Wire:red light 12V Voltage meter:Red light, Yellow light, blue light, green light, white light  2 Wire-red light Measuring voltage:DC4.5V-30.0V Maximum input: DC30.0V. Note: if the input voltage is higher than 30V, permanent damage may occur. Allowable error: ± 1%; when it is greater than or equal to 10V, the error is ± 0.3V; when it is less than 10V, the error is ± 0.10 Input impedance: > 100k Ω Working current: Red < 23mA, green < 18mA, blue < 13mA Refresh speed: about 300ms / time Display mode: three digit 0.56 LED digital tube display Lead length: 20cm Working temperature: - 10 ℃ - 65 ℃ Size:48mm/1.87in x 29mm/1.13in x 22mm/0.86in Opening size :46mm/1.79in x 27mm/1.05in 12V Voltage meter Test accuracy: ± 0.2 Measurement speed: about 2 times per second Wiring mode: two wires can be connected with positive and negative poles. Conductor length: 1m Input voltage: 5-30V Limit voltage: 30V Measuring voltage: 5-20V Product certification: CE / RoHS Product weight: 30g Size:57.2mm/2.23in x 29.3mm/1.14in x 11.8mm/0.46in Package Information: Package Size:90x40x20mm/3.51x1.56x0.78in Package weight:29g/1.02oz Polybag Package Package included: 1 x Digital Voltmeter Noted: 1.Please allow 1-2mm errors due to manual measurement. 2.Item color displayed in photos may be showing slightly different on your computer monitor since monitors are not calibrated same. Note: if the input voltage is higher than 30V, permanent damage may occur. Package Information: Package Size:90x40x20mm/3.51x1.56x0.78in Package weight:29g/1.02oz Polybag Package Package included: 1 x Digital Voltmeter