It is a 0.56" DC 0-100V Red/Blue/Yellow/Green LED Digital Voltage Panel Meter ,Power Supply:DC 7-28V, Measurement Range :DC 0-100V, It has Reverse polarity protection, small size, high efficiency, long term stable and reliable quality,easy installation and use. Application: Battery ,Motorcycle, Car, E-bike, ATV, Scooter, and And other platforms circuit voltage measurement.