• Operating voltage: 3.7 ~ 4.2V (peak current 2A, please be prepared to handle)
• Module size: 2.2cmx1.8cm
• TTL serial port can be used with a direct link to the microcontroller. No need MAX232
• Power on the module automatically boot automatically search network
• Onboard signal lights (with signal flash slowly, no signal flash quickly)
• The world's smallest size, absolutely no smaller than this GSM module.