Update README.md

Author: sh123

README.md

@@ -3,7 +3,7 @@
 ## Introduction
 ⚠ **Please note that this device is experimental and lacks any form of certification. The author holds no responsibility for any fines incurred due to spectrum misuse, legal violations, or damages caused during its use. As with any experimental project, it is essential that you fully understand what you are doing and use it at your own risk.**
 
-This project is a hobby/amateur/toy/educational radio ESP32 based LoRa/FSK Codec2/OPUS DV 3d printed handheld trasceiver a.k.a. walkie-talkie, which is using 1W/2W `E22-400M30S/E22-400M33S` (SX1268) radio module (UHF, 70cm band) or optionally 100mW `RA-01/RA-02` (SX1278) module.
+This project is a hobby/amateur/toy/educational radio ESP32 based LoRa/FSK Codec2/OPUS DV 3d printed handheld trasceiver a.k.a. walkie-talkie, which is using 1W/2W `E22-400M30S/E22-400M33S` (SX1268) radio module (UHF, 70cm band) or optionally 100mW `RA-01/RA-02` (SX1278) module. In theory, it could also be used with `E22-868M30S/E22-900M30S` (SX1262) modules (UHF, 868/915 MHz), but not tested.
 
 It functions like a standard FM walkie-talkie and, for simplicity and traffic optimization, does not utilize any communication protocol. Instead, it transmits audio codec frames (DV) using pre-configured digital radio modulation, such as LoRA or FSK. There are ideas to add voice over AX.25 and perhaps M17 protocol support in the future.