# GSM

> GSM/GPRS/4G modules and dev boards (SIM800, SIM808, A9G, ESP32-SIM7670G) plus GSM relays for IoT

- Shop: [Sigmanortec.ro](https://sigmanortec.ro/en/llms.txt)
- Category page: https://sigmanortec.ro/en/gsm
- Category: Mechatronics and IoT > Sensors and Modules > GSM
- Prices: RON, VAT included; prices and stock as of 2026-10-22 01:32 (Europe/Bucharest)

## Products (10)

### STM32F103 development board, 4G Air780E module, 5V double relay, for IoT
- Page: https://sigmanortec.ro/en/stm32f103-development-board-4g-air780e-module-5v-double-relay-for-iot
- Details: https://sigmanortec.ro/en/llms/p/2316.md
- Price: 156.80 RON
- Availability: In stock; 1-2 zile
- Reference: 88197 · EAN: 5942890340864

Development board with STM32F103C6T6 (32-bit ARM) and 4G Air780E LTE Cat.1 bis module, for IoT projects. Includes two 5V relays controlled via PA4/PA5, flip-up Nano SIM slot, 4G antenna, network status LED and relay status LEDs. Powered at 5V via USB Type-C or KF128 terminal, programmable via SWD or USART. Standby consumption 600µA. Dimensions 62 x 72,5 mm.

### USB Mode on GSM SIM800C – Quad-band, GPRS, Bluetooth
- Page: https://sigmanortec.ro/en/usb-mode-on-gsm-sim800c-quad-band-gprs-bluetooth
- Details: https://sigmanortec.ro/en/llms/p/2380.md
- Price: 67.74 RON
- Availability: In stock; 1-2 zile
- Reference: 88206 · EAN: 5945795457187
- Specifications: Input Voltage: 5 V; Input Voltage Type: “DC” in Romanian can mean **“de ce”**, which translates to **“why”** in English.; Microcontroller: SIM800C; Communication interface: GPRS; Frequency bands: Quad-band; Connectivity: Bluetooth

SIM800C quad-band GSM module with USB connection via CH340T converter, appears as a virtual serial port on PC. Supports SMS, voice calls and GPRS data (multi-slot, max 85.6 kbps) through AT commands, plus Bluetooth 2.4 GHz IEEE802.15. Powered by 5 V DC via USB, auto-elastic Micro/Nano SIM slot, SMA antenna connector, LED network status indicator. Compatible with Arduino, STM32, ESP32.

### SIM808 development module, GSM-GPRS-GPS-Bluetooth, 5–25V
- Page: https://sigmanortec.ro/en/sim808-development-module-gsm-gprs-gps-bluetooth-525v
- Details: https://sigmanortec.ro/en/llms/p/2422.md
- Price: 132.69 RON
- Availability: In stock; 1-2 zile
- Reference: 88227 · EAN: 5943328976884
- Specifications: tension: AD; Supply Voltage: 5; Maximum Input Voltage: 25; Chipset: SIM808; Communication interfaces: GSM, GPRS, GPS, Bluetooth

Development board for communications and localization, ideal for IoT and telemetry projects. It offers quad-band GSM GPRS, precise GPS with fast fix, and Bluetooth, with control via AT commands over UART with autobaud. The UART logic level is selectable at 1.25V, 3.3V, or 5V via VMCU, compatible with Arduino, STM32, ESP32, and Raspberry Pi. Includes GSM and GPS antennas.
The SIM808 development module integrates the SIM808 chip from SIMCom, providing quad-band GSM/GPRS communication (850/900/1800/1900 MHz), a GPS receiver with 22 tracking channels and 66 acquisition channels, as well as Bluetooth connectivity.

### GSM relay module, gate opener, G203, 9–24V, 2G
- Page: https://sigmanortec.ro/en/gsm-relay-module-gate-opener-g202-plus-9-24v-2g
- Details: https://sigmanortec.ro/en/llms/p/2231.md
- Price: 238.75 RON
- Availability: In stock; 1-2 zile
- Reference: 9535 · EAN: 5946024080961
- Specifications: Supply Voltage: 9; Maximum Input Voltage: 24; Output Type Voltage: Closed-Open Contact; Input Voltage Type: “DC” in Romanian can mean **“de ce”**, which translates to **“why”** in English.

GSM relay module for gate opening and access control, fast activation by rejected call or SMS, works on 2G network and is powered at 9-24V. It allows storing up to 1001 authorized numbers and defining administrators and users, includes an external antenna and Nano SIM slot, COM NC NO relay output with configurable pulse time.
GSM remote-control relay module that can be used to open gates, doors, or to remotely control any kind of device or equipment.
The module is the 2G version, which supports only 2G networks and does not support 4G. A 4G model is also available in the catalog.
The relay is activated either by directly calling the SIM card installed in the module or by SMS message.

### ESP32-S3-SIM7670G-4G development board, 4G Cat-1 connectivity, WiFi, Bluetooth, GPS, OV camera, solar charging
- Page: https://sigmanortec.ro/en/esp32-s3-sim7670g-4g-development-board-4g-cat-1-connectivity-wifi-bluetooth-gps-ov-camera-solar-charging
- Details: https://sigmanortec.ro/en/llms/p/2222.md
- Price: 469.49 RON
- Availability: In stock; 1-2 zile
- Reference: 88062 · EAN: 5944675199148

The all-in-one IoT platform for autonomous and mobile projects combines 4G Cat-1 with WiFi and Bluetooth for fast cloud connectivity, includes multi-system GNSS for precise tracking, supports OV camera for capture and streaming, has flexible power supply via USB, 18650 battery or solar panel with integrated charging.
The Waveshare ESP32-S3-SIM7670G-4G development board is a complete multifunctional development module, designed for IoT projects and smart applications that require 4G, WiFi, Bluetooth and GNSS connectivity in a single platform.

### GSM relay module, gate opener, G202 Plus, 9-24V, 4G
- Page: https://sigmanortec.ro/en/gsm-relay-module-gate-opener-g202-plus-9-24v-4g
- Details: https://sigmanortec.ro/en/llms/p/1650.md
- Price: 380.29 RON
- Availability: In stock; 1-2 zile
- Reference: 88188 · EAN: 5940273386232
- Specifications: Supply Voltage: 9; Maximum Input Voltage: 24; Output Type Voltage: Closed-Open Contact; Input Voltage Type: “DC” in Romanian can mean **“de ce”**, which translates to **“why”** in English.; Model: G202 Plus

GSM relay module for opening gates and remote control of equipment, activated by free call or SMS, works on the 4G network and is easily configured with SMS commands, allows authorization of up to 999 users for secure access, has relay with COM NC NO contacts, removable external antenna and DIN rail mounting.
Relay module with remote control via GSM that can be used to open gates, doors or to remotely control any kind of device or equipment.
The module is the 4G version , different from the standard version that only supports the 2G network.
The relay is activated by direct call to the card installed in the module or by SMS message.

### SIM800C module, GSM, GPRS, Quad-Band, Bluetooth BLE, with antenna
- Page: https://sigmanortec.ro/en/sim800c-module-gsm-gprs-quad-band-bluetooth-ble-with-antenna
- Details: https://sigmanortec.ro/en/llms/p/1587.md
- Price: 70.97 RON
- Availability: In stock; 1-2 zile
- Reference: 9480 · EAN: 5949149653539

SIM800C Quad-Band GSM/GPRS module, compatible with Arduino, for data, voice and SMS on 850/900/1800/1900MHz. Includes Bluetooth BLE 3.0, audio interface with microphone, TTS/DTMS support, Serial SPP and a port for a 3.7V Li-Ion battery. Power supply 5-18VDC (max 20VCC). Antenna included, SMA plus IPEX connector.

### A9G, GSM, GPRS, GPS development board
- Page: https://sigmanortec.ro/en/a9g-gsm-gprs-gps-development-board
- Details: https://sigmanortec.ro/en/llms/p/995.md
- Price: 184.28 RON
- Availability: In stock; 1-2 zile
- Reference: 9187 · EAN: 5942231607847

A9G development board offering GSM/GPRS/SMS/Audio connectivity and dual mode GPS/BDS positioning. Includes charging circuit for 3.7V lithium battery, microphone, speaker interface, USB communication, TF card slot, accelerometer, and SPI, I2C2 and ADC interfaces. AT firmware, 5VDC power via Micro USB or 3.7V lithium battery, serial communication speed 2400bps-1.8Mbps, default baud rate 115200.

### SIM800L 2.0 module, GSM, GPRS, Quad-band, with antenna
- Page: https://sigmanortec.ro/en/sim800l-20-module-gsm-gprs-quad-band-with-antenna
- Details: https://sigmanortec.ro/en/llms/p/447.md
- Price: 72.54 RON
- Availability: In stock; 1-2 zile
- Reference: 33066 · EAN: 5942226842024

Quad-band GSM GPRS module for IoT projects and remote control, compatible with Arduino and other boards, uses MicroSIM and includes external rigid antenna with UFL-SMA cable for stable signal. Offers TTL serial interface and support for SMS, calls and data, works in 850 900 1800 1900 MHz networks, requires external power supply 4.5-5V with current over 1A.
Improved version of the SIM800L module, compatible with Arduino and other development boards.
This module is compatible with MicroSIM size cards and comes with a rigid external antenna plus UFL to SMA cable, providing stable and high-performance connectivity in GSM Quad-Band 850/900/1800/1900MHz networks.

### GSM GPRS SIM800L Quad Band module plus antenna
- Page: https://sigmanortec.ro/en/gsm-gprs-sim800l-quad-band-module-plus-antenna
- Details: https://sigmanortec.ro/en/llms/p/381.md
- Price: 45.56 RON
- Availability: In stock; 1-2 zile
- Reference: 33065 · EAN: 5940149208279

GSM GPRS SIM800L Quad Band module with included antenna, compatible with Arduino and other development boards. SIM800L chip, TTL serial port without need for MAX232, automatic boot, status LEDs indicating signal presence. Input voltage 3.7-4.2V, logic level 3.3V (not 5V tolerant). Requires a voltage divider or logic level converter on the RX pin when used with 5V boards.