eBay item number 325269384765
What it says there is the following [and my comments are added in italics and brackets]:
PX41C a HP41C calculator kit. [but apparently the seller assembled the kit, and he is selling the unit assembled]
A fully hand-assembled PX41C.
Includes a 3D-printed bumper case.
hardware emulating the classic HP41C calculator
Features:
- all thru-hole parts (easy to handle and solder)
- Runs about 4x faster than the original.
- memory registers: 3.5 times more memory than the original [So is it effectively a 41cv instead of a 41c?]
- continuous memory (Memory is not lost when calculator is turn off).
- auto power off
- Runs on a single ATMEGA328 8-bit microcontroller running @ 8MHz (same as Arduino Uno)
- speaker for audible keypress feedback
- 192x64 LCD
- display backlight
- Has a real-time clock. (Uses a 32.768KHz crystal.)
- Uses a single CR2032 3V battery.
- Power consumption: 1µA off, 350µA idle, 3mA working (this is with speaker and backlight off)
- Microcontroller comes preprogrammed.
- Can run any of the Voyager series and HP41C calculators, downloading the appropriate firmware.
- Top and bottom aluminum panels.
See YouTube video: https://www.youtube.com/watch?v=5On8Tb-Uc00
THE CALCULATOR COMES FULLY ASSEMBLED. (HAND ASSEMBLED).