What is the range for these?

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.

What is the best way to power it ?

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.

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

Does this board have the charging circuit built in?

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

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Standing screen display size	0.96 Inches
Processor	915 MHz
RAM	other
Wireless Type	Bluetooth
Brand	NEXTION
Series	LoRa 32
Operating System	Others
Item Weight	1.6 ounces
Product Dimensions	1.9 x 1.2 x 0.8 inches
Item Dimensions LxWxH	1.9 x 1.2 x 0.8 inches
Processor Brand	Espressif
Number of Processors	1
Voltage	5 Volts
Manufacturer	DIYmalls - Heltec Automation
ASIN	B07HJ49VN8
Country of Origin	China
Is Discontinued By Manufacturer	No
Date First Available	September 20, 2018

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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