You will need to cut and solder on a small piece of wire (any solid or stranded core is fine) in order to create your antenna. Optionally you can pick up a uFL or SMA edge-mount connector and attach an external duck.

Can I use three or more to broadcast to each other?

Yo dedicate a node to recieve traffic and others to transmit, of course you can alternate at code level to switch between being reciever or transmiter, but that will be hard to orchestrate. So generally u have one node as a gateway (reciever + internet -> iot platform) and senders ....

I am in brazil and here we use the australian frequency channeling (au915). does this device work on au915?

Yes, it works in the 915MHz band

What is the us law on using this? can i continously trasmit data?

It uses the license free ISM band, so you can use it in the US within the power limits that can be defined with the board.

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(PID 3072 RFM95W LoRa Radio Transceiver Breakout - 868 or 915 MHz

Product ID: 35804462

Details

Assembly Required
No
Brand
Adafruit
Item Weight
0.01 Ounces
Manufacturer
Adafruit
Size
2.9cm x 2.5cm

📡868/915 MHz LoRa frequency

🔋Built-in voltage regulator

🛡️Protective tin casing

Description

📡 Unlock limitless wireless freedom—because your projects deserve to roam far and wide!

ROBUST POWER MANAGEMENT - Built-in voltage regulator supports both 3.3V and 5V devices without draining your board.
FLEXIBLE ANTENNA OPTIONS - Supports UF.L or SMA connectors for customizable signal strength and range.
DURABLE WEATHER RESISTANT - Comes with a protective tin to shield your module from environmental wear and tear.
SEAMLESS LONG RANGE CONNECTIVITY - Reach up to 30 miles with advanced LoRa tech—no pairing or scanning needed.
PLUG PLAY ARDUINO COMPATIBILITY - Ready-to-go libraries make integration effortless for your next IoT project.

The Adafruit RFM95W LoRa Radio Transceiver Breakout operates on 868 or 915 MHz frequencies, offering long-range wireless communication up to 30 miles with spreading factor tuning. It features a built-in voltage regulator compatible with 3.3V and 5V devices, comes with a protective tin for durability, and supports easy Arduino integration through ready-to-use libraries. Ideal for IoT and remote sensor applications, it eliminates the hassle of WiFi or BLE pairing, delivering reliable, low-power connectivity.

Specifications

ASIN	B01HYO608A
Best Sellers Rank	#644 in Single Board Computers (Computers & Accessories)
Customer Reviews	4.2 4.2 out of 5 stars (52)
Date First Available	July 4, 2016
Is Discontinued By Manufacturer	No
Item Weight	0.01 ounces
Item model number	8541612042
Manufacturer	Adafruit
Product Dimensions	2 x 1 x 1 inches

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