SMAKN&reg; 0.56" RED LED Waterproof 3 bitS 3 wires Voltmeter DC 0-100V Display color: Blue/Green/Red Display mode: Three 0.56 LED digital tube update rate: About 300 ms/time Physical size: 54 x 24 x 21mm (L*W* H, not including installation ear) Opening size: 54 x 24 mm (L*W)