This is an industrial standard AT-commands-based GSM module, you can easily embed it in your own system to creat a GSM data transfer module. Arduino standard is supported as well.
Common applications are sending/receiving SMS in remote control units, door remote openers, alarm phone calls and/or SMSs.
Power supply: 5VDC
Frequency: 900 – 1800 MHz
Interface: RS232C serial port DB9 female connector
Voice support: mic & earphone adapter
Core GSM engine: Siemens TC35
Antenna: dual band with SMA connector, remotable