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.
Wavecom USB module Q2403A SMS,Voice,Data,Email
SIM800F RS232 Board GSM/GPRS Modem
SIMCom Sim7100E module
LM003 3G HSUPA USB modem is an unlocked 3G modem