Features:This DC voltage meter is small in size, compact design.It can measure and show DC voltage, with wide measuring range.The voltage meter uses 0.56inch 3-digit LED display, clear to read.There are 2 wires, easy to connect; it supports reverse input protection, will not burn out.Widely used for Children's cars, electric bikes, motorcycles to monitor battery voltage, and many other voltage metering purpose.No need of power supply, it can test voltage directly.