Small RF Sender Available in 433MHz (Europe) and 315MHz (US)

This sender breakout board enables you to send data on the designated frequency. This is a 3.3V board. You cannot operate it with 5V.

Make sure you purchase the version for the frequency you intend to use. You cannot change the frequency later. In Europe, use the 433MHz version. The 315MHz version is intended for the US market. In Europe, 315MHz is reserved for military services, and you can get in serious trouble when you operate on this frequency.


This breakout board by default emits 10mW or less and is legal to use in Europe.

Item Value
Voltage 1.8-3.6V
Frequency 433MHz or 315MHz
Output Power <10dBm / <10mW
Modulation Mode AM (OOK)
Transmission Rate <10 Kbps
Size 15x11.8mm


The board comes with three pins plus a solder pad tp connect an antenna.

Always operate these devices with an antenna. If no designated antenna is at hand, use a plain 17.3cm wire for 433MHz, and a 23.8cm wire for 315MHz.

Pin Tag Description
1 VCC +1.8-3.6V
2 DATA Information to send
3 GND negative pole

The RF frequency of the board on is printed on the round silver component. The picture shows the 433MHz variant.


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(content created Apr 01, 2024)