size difference between reg and X large?

I can't tell you that. But the digits on the display screen are 1 full inch tall and 1/4 inch wide. The numerals are a dark black and have a better contrast against the grey background than most LCD displays. The keys on the calculator are 7/8 of an inch wide by 5/8 of an inch tall. The numerals on the keys are a bright white that are between 3/8 and 1/2 an inch high. The plus and equal keys are 3/4 inch wide and a full inch tall. I really like the calculator. It is great for an older person with vision difficulties. I have glaucoma and my vision is diminished. The calculator probably would not be sufficient for someone who is legally visually impaired with 20/200 vision or less. I think it should work for someone with macular degeneration because the numerals are large enough to be seen using one's peripheral vison. I hope this helps.

Do the keys have "tactile feedback," ie can you feel a "click" when key is pressed or are they "mushy?"

Yes, you can definitely hear a slight click every time a key is pressed. They are definitely not mushy as they are plastic.

How is the battery replaced? (no images showing battery door)

It is a rechargeable battery and charged via solar cell. Probably not much of a battery at all because it does not need one. Any place that has light will have enough light to run this calculator. Mine has 2 phillips screws near the top on the rear of the unit but I have not taken it apart and will never have a reason to because if there is not enough light to run it then, I will not be able to read the digits anyway. (The display is a nice, large LCD)

Without an “off” button won’t the battery be in constant use?

No. The calculator shuts off after about 7 minutes of not being used. I just tested the shut off. (The calculator operates on both battery and solar power.)

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🧮 Calculate like a pro, powered by the sun and your hustle.

EFFORTLESS VISIBILITY - Tilted large LCD screen reduces eye strain for marathon calculation sessions.
POWER THAT NEVER QUITS - Dual solar and battery system keeps you calculating anywhere, anytime.
PRECISION AT YOUR FINGERTIPS - Oversized buttons minimize errors and maximize typing satisfaction.
VERSATILITY MEETS SIMPLICITY - 4-function calculator with percent, grand total, and memory keys for all your basic needs.
BUILT TO LAST DESIGNED TO IMPRESS - Robust premium plastic body built for daily hustle and long-term use.

The CATIGA CD-8185 is a compact yet powerful 8-digit desktop calculator featuring a large angled LCD display and oversized buttons for ease of use. Its dual solar and battery power system ensures uninterrupted performance in any lighting condition. Built with a sturdy plastic body and equipped with essential functions like add, subtract, multiply, divide, percent, and memory keys, it’s the perfect tool for home, office, school, or business environments.

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Manufacturer	Jeoly / Catiga Electronic Co. Ltd
Brand	CATIGA
Model number	CD-8185
Product Dimensions	15.24 x 10.16 x 0.25 cm; 132 g
Batteries	1 LR44 batteries required. (included)
Color	Light Purple
Material Type	Plastic
Number of Items	1
Size	Small
Manufacturer Part Number	CD-2786-12
Item Weight	132 g

CATIGA Desktop Calculator 8 Digit with Solar Power and LCD Display, or Home, Office, School, Class and Business, 4 Function Small Basic

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