As you said you have stationary shop and for it want to buy online calculator and for the same asking for Casio Js-40ts product, so on your demand here I am telling for it:

Casio Js-40ts product:

Designed and engineered for performance.

JS-40TS

HEAVY DUTY Calculator
Compact Desk Type
24.2(H) × 107(W) × 174.5(D) mm

Extra Large display

Larger display makes more data easier to read.

Two-way power (Solar + Battery)

Solar powered when light is sufficient, battery powered when light is insufficient.

Key rollover

Key operations are stored in a buffer, so nothing is lost even during high-speed input.

Plastic keys

Designed and engineered for easy operation.

Durable metal Faceplate

Tough cover stands up to rough treatment.

Tax & exchange function

Tax calculation and currency conversion functions.

Profit margin percent

" % " key gives quick access to prices and profits, and also delivers add-ons, discounts, ratios and increase/decrease values.

Function command signs

A symbol (+, -, ×, ÷) on the display indicates the status of operation you are currently performing.

Heavy-duty durable keys

Keys are produced by injecting plastic of two different colors. Key markings are plastic, which means they do not wear or fade with use.