Is this the same thing as an arduino?

Arduino is just a specification for a microcontroller. Although there is an official "Arduino Brand" this model does 100% of what that model does for $5 less. I have a kit that connects every GPIO pin of Arduino, and it connected fine. So for all intents and purposes, this is "the same thing as an arduino."

Ordered two of these and get the same error message: avrdude: ser_open() : can't open device "\\.\COM4": the system cannot find the file specified.

When this happens, I've fixed it by closing the Arduino IDE, unplugging my USB cable from the UNO, plugging it back in, and restarting the IDE. (Save the file before closing the IDE, if desired.) This has always corrected the issue for me, even when the IDE shows an Arduino on COM4 and it's selected yet still seems unavailable.

Does this use the CH340 ?

No. And no. He wants to know the USB chip, not the MCU chip. The USB chip is a CP2021 or whatever, it isn't the CH340.

is the Elegoo compatible with the official Arduino program? (1.8.1 to be exact)

While I have not updated to 1.8.1 yet, I have used it with previous versions with no issues, so I see no reason why it should not work with the latest. I have used 3rd party programs and libraries as well.

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Description

🚀 Elevate your DIY game with ELEGOO UNO R3 — where speed meets reliability!

INTUITIVE I O LABELING - Clear pin names on headers make wiring effortless—no more guesswork, just pure productivity.
VERSATILE POWER OPTIONS - Seamlessly power your board via USB 5V or a stable 7-12V DC input for flexible setups.
ROBUST SHORT CIRCUIT PROTECTION - Built-in PTC fuse safeguards your board from wiring mishaps, keeping your projects safe.
BLAZING FAST 16 M HZ MICROCONTROLLER - Experience smooth, responsive project execution with the ATmega328P core.
PLUG PLAY ARDUINO IDE COMPATIBILITY - Jumpstart your coding with full support for the Arduino IDE, perfect for pros and tinkerers alike.

The ELEGOO UNO R3 Board features a 16 MHz ATmega328P microcontroller paired with an ATmega16U2 USB interface chip, delivering faster data transfer and enhanced memory for Arduino IDE projects. It supports dual power inputs (USB 5V and 7-12V DC) with a recommended 9V 1A for stability, and includes a PTC resettable fuse for short-circuit protection. Clear I/O labeling simplifies wiring, making it an ideal, RoHS-compliant development board for professional and hobbyist electronics projects.

Specifications

Brand	ELEGOO
Product Dimensions	8 x 5.99 x 0.99 cm; 27.22 g
Item model number	EL-CB-001
Manufacturer	Elegoo
Series	ELEGOO UNO R3 Board
Color	Black
Standing screen display size	3
Processor Brand	Atmel
Processor Type	Cortex A8
Processor Speed	16 MHz
Processor Count	1
RAM Size	2 KB
Memory Technology	SRAM
Computer Memory Type	72-Pin EDO SIMM Memory
Hard Disk Description	HDD
Hard Drive Interface	ATA-4
Graphics Card Description	Integrated
Graphics RAM Type	DDR DRAM
Wireless Type	Bluetooth
Optical Drive Type	BD-R
Operating System	Windows 10
Are Batteries Included	No
Item Weight	27.2 g

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