Reliable Solutions from a Trusted Manufacturer

With the rise of electronic cheating in exam halls, signal blockers have become an essential tool for maintaining exam integrity. As a manufacturer specializing in information security protection, we have 21 years of experience in research and development. Our devices are recognized for reliable quality and competitive pricing, making them a reliable choice for exam environments. For those having customizable requests or seeking reliable signal blocker manufacturers, we welcome you to consult with us. 

Key Specifications

Parameter	Details
Frequency Coverage	758–5850 MHz
Channels	12 Channels
Supported Signals	2G / 3G / 4G / 5G / WiFi 2.4G / WiFi 5.8G
Range	8–100 m
Output Power	37–40 dBm
Power Consumption	480W
Size	435 × 293 × 130 mm
Weight	7.2 kg

Why Choose Our N-14-120W?

• Multi-Band High-Power Coverage: Blocks GSM/CDMA/3G/4G/5G/Wi-Fi simultaneously for full protection.

• Adjustable Power & Strong Signal Blocking: Power can be adjusted; even in areas with the strongest mobile signals (near base stations), it effectively blocks signals over 10 meters—solving the limitations of ordinary blockers near base stations.

• Directional Precision: Built-in directional modules ensure targeted and efficient interference.

• Safe for Surrounding Networks: Only blocks on-site mobile devices; nearby base stations remain unaffected.

• Strong Security Benefits: Eliminates unauthorized communication, recording, live-streaming, or data leakage.

• Ideal for High-Risk Areas: Perfect for courts, prisons, exam halls, confidential meetings, and security-sensitive zones.

How Does the N-14-120W Work?

The N-14-120W operates by generating a controlled RF environment within a designated zone. When activated:

1. The system’s directional antenna array emits regulated, low-interference RF signals across selected communication bands.
2. Mobile devices within this zone cannot establish stable communication links with nearby base stations.
3. Calls, messages, data connections, Wi-Fi, and other wireless functions remain inactive during the system’s operation.
4. Surrounding base stations and external areas remain unaffected, as the system only influences the localized coverage area.

Warranty

• Standard 12-month warranty covering manufacturing defects and component failures.

• Lifetime maintenance support is available from our technical team.

• Optional extended warranty plans can be purchased depending on regional requirements.

Precautions

1. Factors affecting the actual shielding range include signal field strength, base station distance, mobile phone format, obstacles, installation height, installation specifications, etc.

2. It is normal for the host to heat up after working for a long time. If the temperature is too high, please turn off the power and contact your local dealer

3. The normal installation height is 1.8m～3m, try to choose the place where there is no obstacle between the target shielding area.

FAQS

1. What frequency bands can your products block? Does it support 5G?
Our devices support full-spectrum blocking, including 2G/3G/4G/5G, Wi-Fi 2.4G/5.8G, GPS L1–L5, Bluetooth, UHF/VHF, LoRa, etc. Specific bands can be customized according to your application requirements.

2. Can output power be adjusted individually per band? Why is this important?
Yes. Each frequency module supports independent power adjustment. This allows for:

• Accurate control of the blocking radius (preventing unwanted overspill)

• Enhancing specific bands with strong external interference

• Reducing noise and power consumption while improving system stability

3. Is it effective in high-signal environments (e.g., <200 meters from cell towers)?
Absolutely. Featuring built-in high-power directional RF modules and high-gain antennas, our blockers remain effective even under extreme interference levels from nearby base stations.

4. Will the signal blocker affect other electronic equipment, like projectors or microphones?
No. Our signal blockers only target wireless communication frequencies (e.g., mobile, WiFi, GPS). They won’t affect wired audio-visual equipment.

5. Can I adjust the power output of each frequency?
Yes. Each frequency module can be independently adjusted to control the blocking distance (e.g., 8–100 meters) based on your actual environment.

6. Will multiple omnidirectional blockers interfere with each other?
No, if properly installed. We provide optimized layout and directional separation to avoid overlap or interference between units.

7. Do I need to install any equipment outside the classroom?
Usually not. But in extreme environments (e.g., near strong outdoor base stations), we may recommend an outdoor blocking unit to strengthen coverage from both sides.

8. Does installation require damaging the building structure? Can the layout be flexible?
No structural damage is needed. The blocker can be mounted on walls, ceilings, or pillars. Recommended installation height is 2.5–3 meters, and the layout is fully adaptable to your site conditions.

9. Can the device operate 24/7? Is it prone to overheating?
Yes. Our blockers support continuous 24/7 operation and are equipped with 6-zone fan cooling and soft-start circuitry for stable long-term performance without freezing or overheating.

10. Do you support OEM/ODM? Can the device be customized for specific scenarios?
Yes. With over 21 years of OEM/ODM experience, we can customize power levels, frequency bands, housing structure, and communication protocols for classrooms, conference rooms, prisons, military sites, vehicles, and more.