Working bands	TD-SCDMA2100/1900 MHz GSM900/1800 MHz (Data only or Telematics) For detailed information about the working bands supported, seeOverview.
Working temperature	Normalworking temperature: –20°C to +70°C
Working temperature	Extreme working temperatures: –30°C to –20°C and +70°C to+75°C
Ambient temperature for storage	–40°C to 85°C
Power voltage	3.3–5.5 V (3.8 V is recommended.)
AT commands	See theHUAWEI MT509 LGA Module AT Command Interface Specification.
Applicationinterface (116- pin LGA	UART (supporting 8-wire UART)
Applicationinterface (116- pin LGA	One standard Subscriber Identity Module (SIM) card interface (3 Vor 1.8 V)
Audio(OPTION) :	(only telematics version supports this function) For detailed information about the working bands supported, seeOverview.
Audio(OPTION) :	2×Micphone in/1×Handset out/1×Speaker out/1×PCM
SMS	Management of text messages: read messages, delete messages, storage status, and message list