Our produce made from ABS, small size with 89.644.624.4 mm, about 68g, only your palm size and suitable for all kind of place. Our produce not only can show the voltage, current, energy and power, blue LCD background can help you get the digital easy, have obtained CCC, FCC, CE certificate. Voltage test range DC 6.5-100V, current 0-20A, power: 0~2kW, energy 0~9999kWh, suitable for most of place, adding alarm threshold, please DO NOT exceed the rated parameters. Voltage alarm function; Energy reset function; Data storage when power off; Built-in shunt,no need for external shunt. This module is suitable for indoor, not outdoor. Applied load can not exceed the rated voltage and current. The max load of this meter is 20A. 20A are only for short loads, but not for continuous operation. We recommend you change to 50A version if youuse with a continuous output more than 15A. Size Name:20A