The SIM300D/340D is a complete Tri-Band/Quad-Band GSM/GPRS solution in a SMT module.

SIM300D/340D with a tiny configuration can fit almost all the space requirements in your M2M applications like AMR, POS, Security, AVL etc.
  ★SMT type suit for customer applications
  ★ An embedded powerful TCP/IP protocol stack
  ★ Based upon mature and field-proven platform, backed up by our support service, from definition to design and production

General features
  ★ Tri-Band GSM/GPRS 900/1800/1900MHz or
    Quad-Band GSM/GPRS 850/900/1800/1900MHz
  ★ GPRS multi-slot class 10/8
  ★ GPRS mobile station class B
  ★ Compliant to GSM phase 2/2+
     – Class 4 (2W @ 850/900 MHz)
     – Class 1 (1W @ 1800/1900MHz)
  ★ Dimension: 33mm x 33mm x 3mm
  ★ Weight: 7.8 g
  ★ Control via AT commands (GSM 07.07, 07.05 and SIMCom enhanced AT Commands)
  ★ SIM application toolkit
  ★ Supply voltage range 3.4V...4.5V
  ★ Low power consumption 
  ★ Normal operation temperature: -30 °C to +80 °C
  ★ Restricted operation temperature: -40 °C to -30 °C and +80 °C to +85 °C
  ★ Storage temperature: -45°C to +90°C

Specifications for fax
  ★ Group 3, class 1

Specifications for data:
  ★ PBCCH support
  ★ GPRS class 10: max. 85.6 Kbps (downlink)
  ★ PPP-stack
  ★ Coding schemes CS 1, 2, 3, 4
  ★ CSD up to 14.4 kbps
  ★ USSD
  ★ Non transparent mode

Specifications for SMS via GSM
  ★ Point-to-point MO and MT
  ★ SMS cell broadcast
  ★ Text and PDU mode

Specifications for voice
  ★ Tricodec
– Half rate (HR)
– Full rate (FR)
– Enhanced Full rate (EFR)
  ★ Hands-free operation (Echo suppression)

Interfaces
  ★ Interface to external SIM 3V/1.8V
  ★ Two analog audio interfaces
  ★ RTC backup
  ★ Serial interface and debug interface
  ★ LCD interface
  ★ Keypad interface
  ★ Antenna connector and antenna pad
  ★ GPIO