Question 1

What is the range for these?

Accepted Answer

The nominal claim for the range is about a kilometer,  but that depends on the physical environment like terrain, trees and buildings and on the size of the antenna.  Normally the units are supplied with a quarter wave antenna but some manufacturers only supply what appears to be an eighth wave antenna.  If you want the maximum range (about two kilometers) buy a half wave antenna.

Question 2

What is the best way to power it ?

Accepted Answer

There is no off-switch, so be careful plugging things in, but there are many options to power these.  
Here is what we have tested:
-- MICRO_USB: standard 5 VDC USB supply in the on-board connector and the units immediately power up, unplug to turn off.
-- 5 VDC to GRD through the input-rail (well marked on PCB)
-- 3.7 VDC to GRD through the input-rail (again marked on PCB)
-- 2-PIN, MALE 1.25 mm CONNECTOR: wire a charged 3.6 or 3.7 V Li-Ion RECHARGEABLE CELL to (+) or (-), plug in, and the units power up immediately 
(NOTE: with the rechargable cell wired in, you will be able to charge it from the MICRO_USB port (and on-board charge control).
HEADS UP:
-- 2-PIN: a 3.6 V Li-PRIMARY, single cell (ie. Non-Rechargeable, Single-Use, Lithium Thionyl Chloride Battery LiSOCL₂, as often used with remote Utility metering) DOES NOT SUPPLY ENOUGH DISCHARGE CURRENT to fully power -- the device will begin to boot, but never leave the booting sequence -- tried 3 different cell vendors (EEMB, SAFT or PKCELL).
-- 2-PIN-Danger: Attaching a 9 V DC Standard Alkaline cell or two Primary Lithium cells in series (or parallel) does Power up the units, HOWEVER, it is dangerous if you accidentally plugged in the MICRO-USB (for programming or??), as it will attempt to charge the Alkaline or primary cell and cause damage.

Question 3

where is this made?

Accepted Answer

The 915mhz esp32 lora is made in China, by heltec

Question 4

Does this board have the charging circuit built in?

Accepted Answer

The lora board can be powered via USB 5V, 3.7V lithium battery, 3.3V or 5V (pin)

ASIN	B07HJ49VN8
Brand	NEXTION
Built-In Media	2 x LoRa 32 V3 board, 2 x 1.25mm 2pin cable, 2 x lora antenna 915
Compatible Devices	Arduino, Raspberry Pi, Smartphone, Sensors, Actuators, IoT Devices
Connectivity Technology	Bluetooth, Wi-Fi
Customer Reviews	4.5 4.5 out of 5 stars (146)
Item Weight	1.6 Ounces
Mfr Part Number	Na
Model Name	LoRa 32 V3
Operating System	Linux
Processor Brand	Espressif
Processor Count	1
Processor Speed	915 MHz
RAM Memory Technology	DDR3
Total Usb Ports	1
UPC	747356629140
Wireless Compability	Bluetooth

2Sets 868MHz-915MHz SX1276 ESP32 WiFi Bluetooth LoRa Module Development Board with 0.96 OLED Display & Antenna Transceiver IOT for Arduino LoraWan Internet of Thing WIshioT

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