SLE Sometimesa USB cable is included. Other times not. If it does not state that a cable is included - it is not.

SLE It is fully compatible and I have 1st hand experience to use it. Work very well!!!

SLE Yesit is.

SLE No,this specific Arduino model board does not support Bluetooth. Bluetooth is supported by NANO 33LB: Bluetooth Low Energy (BLE) is optimized for low power use at low data rates and is therefore perfect for connecting peripherals to a phone or computer. The connection is handled by the ArduinoBLE library.

SLE Yes, in a very well lit (natural sunlight) workshop , the meter reading is very pleasant and high in readability. Indirect harsh sunlight outdoors it is a bit difficult to read. Turning the meter o that no direct sunlight falls on the display improves readability.

SLE It is a micro USB.

SLE Ruben, given that the manufacturer fitted it with a USB port, and stated in the specs that 5V DC is the supplied voltage, I'd rather use 5V DC. However, many integrated circuits these days works with 3,3V DC, but again, the manufacture states 5V DC. It could be that a 3V3 DC voltage regulator is fitted to the board, regulating the supply voltage to 3V3. If this is the case, then your 3V7 battery should work just fine. It would be great to have a circuit diagram to see what the supply voltage actually is. But cct diagrams is often proprietary info. Feel free to try it, you will not damage the board.

SLE Yes, you can flash the eprom and load other BIOS.