This is an Arduino / Seeduino Stalker compatible shield to interface to the RFD900, long range radio modem.
If you need long range communications for your project, this will make connecting the RFD900 to a Seeduino stalker, or similar, easy !
An on board regulator allows direct supply from a 12V battery, or up to a 4S lithium pack.
Shutdown / RTC pins also allow complete shutdown when interfaced with a Seeduino stalker board.
It has switchable serial source, from either the hardware serial port, or software serial.
It has the standard arduino form factor and uses only power, TX, RX and GND pins on the header.
Also available is a user selectable jumper to allow a separate power supply to the modem.
A datasheet for the shield is available here : RFD900 Shield V2 Datasheet
Schematics of the board are available here : RFD900 Shield V2 Schematic