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.
LM003 3G HSUPA USB modem is an unlocked 3G modem
SIM800F is a complete Quad-band GSM/GPRS solution
Siemen MC55i Modem with Earphone USB Port
Wavecom USB module Q2403A SMS,Voice,Data,Email