From Micro Ohm's description

Arduino Nano CH340 – Soldered Pins, Mini USB Without USB Cable The Nano CH340 Chip Board Chip without USB Cable chipboard is based on the famous Arduino platform and does all the functions of Uno, but with a smaller footprint. The Nano equips a low-cost USB-Serial Chip that makes it less in price than Nano with FTDI USB-Serial Chip used on older versions of Arduino Nano. The Nano is a small, complete, and breadboard-friendly board based on the ATmega328 (Arduino Nano R3). It has more or less the same functionality as the Arduino Uno but in a different package. It lacks only a DC power jack and works with a Mini-B USB cable instead of a standard one. The Nano can be powered via the mini-USB connection, 6-20V unregulated external power supply (pin 30), or 5V regulated external power supply (pin 27). The power source is automatically selected to the highest voltage source. The size of Nano V3.0 with CH340 Chip is only 43 mm x 18 mm; it comes with 6 PWM I/O from the total of 14 digitals I/O, 8 analog inputs, 16Mhz clock speed and 32kB of flash memory. Note:- CH340 chip might not work directly with some PC/Laptop, you will need some ch340 drivers. If you are getting the error while uploading the code in the Arduino Nano or not detecting the port need to upload thebootloader. Why Consider the Official Boards? Feature Official Arduino Boards Clone Boards Warranty ✅ 1-Year Official Warranty ❌ None / Limited Build Quality ✅ High-Grade Components ⚠️ Varies Software Support ✅ 100% Compatible ⚠️ May Face Issues Firmware Updates ✅ Regular Official Releases ❌ Rare / None Durability ✅ Long Lifespan & Support ⚠️ Shorter Life Features: 1 pair of TTL level serial transceiver ports RX / TX Using Atmel Atmega328P-AU MCU There is a bootloader installed in it Support for external 5V ~ 12V DC power supply Support power supply by 9V battery Support ISP download Automatic reset during program download. Power OK blue LED on the bottom. Green (TX), red (RX), and orange (L) LED. +5V to AREF jumper. Auto-sensing/switching power input. Small mini-B USB for programming and serial monitor (cable not included). ICSP header for direct program download. Standard 0.1” spacing DIP (breadboard friendly). Manual reset switch. Package Includes: 1 x Nano CH340 Chip Board without USB cable compatible with Arduino (Soldered) أردوينو نانو CH340 – أطراف ملحومة، Mini USB المقدمة يُعد أردوينو نانو CH340 مع منفذ Mini USB نسخة مدمجة ومجهزة بالكامل من لوحة أردوينو نانو، حيث يأتي بأطراف ملحومة مسبقًا لسهولة الاستخدام على الـ Breadboard. يستخدم شريحة CH340 لتحويل USB إلى Serial ، مما يضمن توافقًا مع معظم أنظمة التشغيل. يعتمد على المتحكم ATmega328P ويقدم نفس وظائف أردوينو أونو لكن بحجم أصغر مناسب للتجارب والنظم المدمجة. الميزات الرئيسية يعتمد على المتحكم ATmega328P. مبرمج عبر شريحة CH340 USB-to-Serial. أطراف ملحومة مسبقًا – جاهزة للاستخدام. منفذ Mini USB. 14 طرف إدخال/إخراج رقمي (منها 6 PWM). 8 مداخل تماثلية. متوافق مع Arduino IDE. حجم صغير مناسب للـ Breadboard. المواصفات الفنية المتحكم: ATmega328P. USB-to-Serial: CH340G. جهد التشغيل: 5 فولت. جهد الدخل الموصى به: 7 – 12 فولت. أطراف I/O رقمية: 14 (منها 6 PWM). مداخل تماثلية: 8. ذاكرة فلاش: 32 كيلوبايت (2 كيلوبايت للـ Bootloader). SRAM: 2 كيلوبايت. EEPROM: 1 كيلوبايت. سرعة المعالج: 16 ميجاهرتز. منفذ: Mini USB. الأبعاد: تقريبًا 45 × 18 مم. التطبيقات مشاريع إلكترونية وهوايات. التجارب على Breadboard. الروبوتات والأتمتة. أنظمة إنترنت الأشياء والأنظمة المدمجة. مختبرات تعليم الإلكترونيات.

From Ampere Electronics's description

Arduino Nano CH340 Chip The Arduino Nano is a small, complete, and breadboard-friendly board based on the ATmega328 (Arduino Nano 3.x). It has more or less the same functionality of the Arduino Duemilanove, but in a different package. It lacks only a DC power jack, and works with a Mini-B USB cable instead of a standard one. Specifications: Microcontroller ATmega328P – 8-bit AVR family microcontroller Operating Voltage 5V Recommended Input Voltage for Vin pin 7-12V Analog Input Pins 6 (A0 – A5) Digital I/O Pins 14 (Out of which 6 provide PWM output) DC Current on I/O Pins 40 mA DC Current on 3.3V Pin 50 mA Flash Memory 32 KB (2 KB is used for Bootloader) SRAM 2 KB EEPROM 1 KB Frequency (Clock Speed) 16 MHz Communication IIC, SPI, USART Difference between UNO and Nano The Arduino-Nano is very much similar to the Arduino UNO. They use the same Processor (Atmega328p) and hence they both can share the same program. One big difference between both is the size. UNO is twice as big as Nano and hence occupies more space on your project. Also, Nano is breadboard friendly while Uno is not. To program an Uno, you need a Regular USB cable; whereas for Nano, you will need a mini USB cable. The technical difference between Uno and Nano is shown below: Name Processor Operating/Input Voltage CPU speed Analog In/Out Digital IO/PWM EEPROM / SRAM[kB] Flash USB USART Uno ATmega328P 5V / 7-12V 16 MHz 6 / 0 14 / 6 1 / 2 32 Regular 1 Nano ATmega328P 5V / 7-12V 16 MHz 8 / 0 14 / 6 1 / 2 32 Mini 1 Package Includes: 1x Arduino Nano Documents: Arduino Nano Datasheet Related Products: Arduino Boards

From Micro Ohm's description

The CH340 not Soldered Nano Board R3 Chip is based on the famous Arduino platform and does all the functions of Uno, but with a smaller footprint. Nano CH340 Not Soldered Board R3 Chip is vital for your small project where you don’t need much of a pin-outs but the small size is very important to make it look good. The Nano equips a low-cost USB-Serial Chip that makes it less in price than Nano with FTDI USB-Serial Chip used on older versions of Arduino Nano. The Nano is a small, complete, and breadboard-friendly board based on the ATmega328 (Arduino Nano R3). It has more or less the same functionality of the Arduino Uno but in a different package. It lacks only a DC power jack and works with a Mini-B USB cable instead of a standard one. The Nano can be power via the mini-USB connection, 6-20V unregulated external power supply (pin 30), or 5V regulated external power supply (pin 27). The power source is automatically selected to the highest voltage source. The size of Nano V3.0 with CH340 Chip is only 43 mm x 18 mm; it comes with 6 PWM I/O from the total of 14 digitals I/O, 8 analog inputs, 16Mhz clock speed and 32kB of flash memory. Note:- CH340 chip might not work directly with some PC/Laptop, you will need some ch340 drivers. Features : 1 pair of TTL level serial transceiver ports RX / TX Using Atmel Atmega328P-AU MCU There is a bootloader installed in it Support USB download and Power Support for external 5V ~ 12V DC power supply Support power supply by 9V battery Support ISP download Automatic reset during program download. Power OK blue LED on the bottom. Green (TX), red (RX) and orange (L) LED. 5V to AREF jumper. Auto sensing/switching power input. Small mini-B USB for programming and serial monitor (cable not included). ICSP header for direct program download. Standard 0.1” spacing DIP (breadboard friendly). Manual reset switch. Package Includes : 1 x Nano CH340 Chip Board Without USB cable compatible with Arduino (not Soldered) Analog I/O Pins 8 Architecture AVR Clock Speed 16 MHz Color Blue DC Current per I/O Pin (mA) 40 Digital I/O Pins 22 EEPROM 1KB Flash Memory 32 KB Input Voltage(Recommended) 7-12 V Microcontroller ATmega328 Operating Voltage (VDC) 5 Power Consumption (Watt) 1 PWM Output Pins 6 SRAM 2 Weight (gm) 8 Shipment Weight 0.012 kg Shipment Dimensions 6 × 5 × 3 cm

From Most Electronic's description

The Arduino Nano with CH340 Uploader – Mini USB is a compact and cost-effective microcontroller board based on the ATmega328P . It delivers the same performance as the Arduino Uno but comes in a smaller form factor, making it ideal for space-constrained projects. It runs at 16 MHz and includes 32KB Flash memory , 2KB SRAM , and 1KB EEPROM . In addition, it offers 14 digital I/O pins (6 with PWM), 8 analog inputs , and operates at 5V . Because it uses the CH340 USB-to-serial chip , it provides stable communication with your computer. Also, it connects through a Mini USB cable , therefore programming and powering the board is simple and convenient. The Arduino Nano is fully compatible with the Arduino IDE and supports all standard libraries and examples. For example, it can be used in robotics, wearables, IoT devices, and DIY electronics . Key Features: Microcontroller: ATmega328P Operating Voltage: 5V Clock Speed: 16 MHz Memory: 32KB Flash, 2KB SRAM, 1KB EEPROM 14 Digital I/O pins (6 PWM outputs) 8 Analog inputs USB-to-Serial: CH340 Connector: Mini USB Fully compatible with Arduino IDE Perfect for students, hobbyists, and engineers, the Arduino Nano with CH340 Uploader is the ideal choice for compact, reliable, and affordable prototyping.