C.J. SHOP 5pcs 0.28 Inch DC 2.5V-30V 5 Colors LED Mini Digital Voltmeter Voltage Tester Meter Detection voltage: DC2.5V ~ 30V Working current: &lt;30mA Display: 0.28 inch LED Dimensions: 31  12.0  9mm (length x width x height) Installation hole: 23  10 mm