RFM95 long range radio module - 3 freq. by your country
18650 li-on Battery charging
native HW USB for next features like, modem, sniffer ....
Working software features:
Send message ... compose and send message to specified recipient or broadcast
Receive message ... message is received on background and stored in memory.
Message editor ... write message about +/- 80 characters long ... 80 is now best readable on full display ....
Message memory ... all send/received messages are stored in memory
Display memory ... display memory content
Battery ... display status only GOOD/LOW
Config ... user radio configuration spread factor / power
check message delivery confirmation
contact list display and check online contacts
select recipient or broadcast
BEST working feature - resend undelivered messages if delivery fail, message is stored with "undelivered" attribute. Every station at power on broadcast "Ready receive status", then if any near station receive this broadcast and have undelivered message automatically try send this messages, if then receive confirmation mark messages in memory as DELIVERED :)
Mass storage bootloader - easy upgrade firmware, just drag&drop
Future software features:
Mesh messaging compatible with Meshtastic network...
868Mhz is for EU You can select in setup 915Mhz for US but you can decrease performance,
I do not know how much, there is no universal module (I asked in HopeRF)
On my quick outdoor test I am not see difference.