Specifications: Working voltage of Meter: DC 4 - 30V Working current of Meter: ≤20mA Voltage Measuring range: DC 0 - 100V Current Measuring range: DC 0 - 10A Voltage resolution (V): 0.1V Current resolution (A): 0.01A Measure accuracy: 1% (± 1 digit) Display: 0.28" digital tube, Two color blue and red Refresh rate: about 300mS / times Dimensions: 48mm*29mm*21mm Operation Temp: -10°-+65° Note: The maximum input voltage can not exceed 30V. Otherwise the meter will be burned out. Package Included: 2* 0.28" Digital Voltmeter Ammeter DC 100V 10A Blue + Red Dual LED Display 2* Set of two wires