Extra large display:

You can more easily read the data into a more large display

Two won power supply (solar + battery):

If the light is sufficient if powered with solar light and insufficient supply power to the battery

Key Rollover:

Key operations are stored in the buffer it will not be lost even during high-speed input

Plastic keys:

It designed and built to be easily manipulated

Fixed Percentage:

Fixed percentage calculations

Margin:

All calculations in the margins of the converter can be simplified cost and profit calculations