With SOS Call button and tow-way voice function
GSM Dialer/SOS Call is a Brevity,Fashion,Neat design Emergency call unit, it is special for emergency call out for help. It is suitable for senior, elderly, or community area, public area for emergency call.
USB GSM GPRS Edge Module – Simcom
SIM800F is a complete Quad-band GSM/GPRS solution
Wavecom USB module Q2403A SMS,Voice,Data,Email
WAVECOM Q2403A PCI GPRS MODEM speed