ITEM NAME:Voltmeter Ammeter Digital Multimeter Voltmeter Panel Meter LED Blue + Red L9Y1 Voltmeter Ammeter Digital Multimeter Voltmeter Panel Meter LED Blue + Red L9Y1 Dimensions: 5 x 3 x 8 cm Supply Voltage: DC 4.5-30V Measuring Voltage: 0-100V Measuring Current: ue00A Light Color for display: Blue (voltage), red (power) Method for wiring: Thin red line: positive power supply input (DC 4,5-30V) Thin black line: negative power supply input (DC 4,5-30V) Thick red line: positive voltage measurement input. Thick black line: cable for output voltage (It is connected to the thin black line and for the measurement of the negative voltage input.) Thick yellow line: cable (to connect it is to the positive pole, the thick red should be connected to the negative pole.) Input Voltage Package content : 1 x Voltmeter and Ammeter 2 x Connection Cable Note:Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm..Thick yellow line: cable (to connect it is to the positive pole, the thick red should be connected to the negative pole.).