4G GSM Access Controller – Remote SMS Gate & Door Switch
4G GSM Access Controller – Remote SMS Gate & Door Switch
4G GSM Access Controller – Control Gates, Doors & Equipment Remotely
The G202 4G GSM Access Controller is a compact, reliable remote switch that lets authorized users open gates, doors, barriers, and control equipment with a simple free phone call or SMS command — no internet connection required. Ideal for garages, warehouses, hotels, car parking systems, and any location where remote ON/OFF switching is needed.
⚠️ Important Notice: A 4G SIM card that supports both VoLTE and Data functions is required for 4G operation.
Key Features
- Free Call Activation: Authorized users simply dial the device's SIM number — the controller rejects the call (no charge) and triggers the relay action instantly.
- SMS Command Control: Send SMS commands to remotely switch equipment ON or OFF from anywhere in the world.
- Wide Compatibility: Works with doors, gates, barriers, car parking systems, garage doors, warehouse access points, and more.
- Dual Network Support: Operates on both 2G GSM and 4G LTE networks for maximum coverage flexibility.
- Broad Voltage Range: Accepts DC 9V–36V input, making it easy to integrate into various existing systems.
- Wired Switch Support: Supports a physical wired switch in addition to remote control.
- Compact & Lightweight: Dimensions of 96.5 × 50 × 31.5 mm and weighing only 88g — easy to install in tight spaces.
- Durable ABS Housing: Light gray ABS casing built for long-term indoor and light outdoor use.
Technical Specifications
| Rated Voltage | DC 9V–36V / 1A |
| Working Temperature | -10°C to +60°C |
| Storage Temperature | -20°C to +60°C |
| Relative Humidity | 10–90%, No Condensation |
| 2G Frequency | 850 / 900 / 1800 / 1900 MHz (GSM) |
| 4G Bands | B1 / B2 / B3 / B4 / B5 / B7 / B8 / B20 / B28 / B38 / B40 / B41 / B66 |
| Communication Protocol | GSM / 4G Phase 2/2+ (includes data service) |
| Output Relay Voltage | 3A / 240V AC |
| SIM Card Type | Nano SIM, 3V |
| Antenna | 50Ω SMA |
| Dimensions | 96.5 × 50 × 31.5 mm |
| Net Weight | 88g |
| Color | Light Gray |
| Material | ABS |
What's in the Box
- 1 × G202 4G GSM Access Controller
Note: SIM card and external antenna not included. Color may vary slightly due to display settings. Measurement tolerance is ±1–3 cm.
Made in Mainland China.
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Frequently Asked Questions
Q: What type of SIM card does the G202 4G GSM Access Controller require?
A: The G202 requires a Nano SIM card (3V). For 4G operation, the SIM card must support both VoLTE and Data functions. A standard 2G GSM SIM card can also be used if 4G is not needed.
Q: Does activating the gate or door via phone call cost anything?
A: No. The GSM Access Controller works by receiving a call from an authorized number and then rejecting it immediately — triggering the relay action. The call is never connected, so there are no call charges to the caller.
Q: What kinds of devices or locations can this controller be used with?
A: The G202 GSM Access Controller is versatile and can be used to control gates, doors, barriers, garage door openers, car parking systems, warehouse access points, hotel entrances, and any equipment that can be operated via an ON/OFF relay switch within the relay's rated capacity (3A / 240V AC).
Q: What is the input voltage range for installation?
A: The controller accepts a wide DC 9V to 36V at 1A input, making it compatible with a broad range of power supplies and existing access control infrastructure.
Production & Packaging Notice
To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.