These boards were designed with ease of use in mind.
When coupled with our Saleng GSM library, these boards work immediately out of the box.
Saleng GSM shield
comes in the R3 formfactor
easier to use , no complicated wiring
Saleng GSM Module / ” Complete GSM Module “
smaller form factor than the shield
requires wiring of the power and , at a minimum, the TXD and RXD pins.