Yeeco 3 in 1 3-Wire DC0-33V 0.56" DC Digital Voltmeter Voltage Panel Meter Tester Monitor Volts Gauge Temp Gauge 24-hour Electronic Clock Car Motor Red LED Display with Waterproof Stainless Probe Display: Bright four digits 0.56" LED digital tube 24-hour time meter;power-off memory function and long working Power supply voltage: DC 7-30V; measurement temperature range: -55-125 c Temperature,voltage,time,displayed alternately ;two buttons on panel to switch modes of time, voltage or temperature Meter will not burn with reversed connection protection