Range: DC 7~100V; For two wires products; Can work for 12V 24V 36V 48V 60V 72V 84V 92V; With 2 wires easy to connect car electromobile and motorcycle inside circuit; With reverse protection; Used to monitor battery voltage and know battery voltage status can be also used to other products voltage measurement; Low working voltage: 7.0V; Max. working voltage: 100V; working temperature: -10~65'C; Working humidity: 10~80% (No condensation); Working air pressure: 80~106kPa; 0.65" 3-digits digital tube; Features: Good stability high precision easy to install; Circuit polarity protection