A portable signal blocker device with multiple fans inside a metal case, with visual indicators for 5G, 2G, 3G, 4G, and WiFi frequencies.
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Black phone blocker with fans on a white background
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120W Adjustable N-14 Directional Cell Phone Blocker 2/3/4/5G/WIFI/GPS/Bluetooth Wifi Blocker for Anti-cheating

$1,500.00

Effective Anti-Cheating Cell Phone Blocker in Exam Halls

  • Full-Band Coverage: Instantly blocks 2G–5G, Wi-Fi, Bluetooth & GPS to create a secure, no-communication exam zone.
  • Directional Blocking: Precisely disrupts wireless signals, ensuring a fair and fully secure testing environment.
  • Adjustable Power & Range: Flexible 8–100m coverage adapts to any exam hall or room size.
  • High Power 120W Output: Covers large exam halls with stable, no-blind-zone protection.
  • Continuous 24/7 Operation: Advanced aluminum radiator and silent fans support up to 24 hours of uninterrupted use, keeping exams protected throughout long sessions.
  • Customizable Frequency Bands: Fine-tune blocking frequencies to meet local standards.
  • Factory-Direct Reliability: 21 years of R&D, certified quality, and global technical support.
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Overview

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. 

Cell phone jammer details
cell phone blocker size
Advantages of our Cell Phone Signal Blocker: Primary Factory, 3-year Warranty, Customizable Solutions.
Visual guide to the ODM & OEM partnership process for Signal Blocker production.

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.
WiFi blocker and portable signal blocker for school and office use

FAQS

1. What frequency bands can your products block? Does it support 5G?
Our devices support full-spectrum jamming, 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 jamming 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 jamming 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.
Specification

Category Performance and Metrics
Size 435 × 293 × 130 mm (Length × Width × Height)
Weight 7.2 kg (main unit)
Shielding Range 8–100 m (depending on the strength of the base station signal)
Power Supply & Consumption AC110–220V / DC24V / 20A, Power Consumption: 480WBuilt-in dual switching power supply
Operating Temperature -10℃ to +55℃
Storage Temperature -20℃ to +60℃

Electrical Parameters

Channel Shielded Signals Operating Frequency Frequency Range Output Power Channel Output Power
CH1 Broadcast 5G / Mobile 5G 758–803 MHz 40 dBm 5 dBm / 30KHz (min)
CH2 CDMA / Telecom 2G / 4G 851–894 MHz 40 dBm 5 dBm / 30KHz (min)
CH3 GSM / Mobile 2G 4G / Unicom 4G 925–960 MHz 40 dBm 5 dBm / 30KHz (min)
CH4 DCS / Mobile 2G 4G / Unicom 4G / Telecom 4G 1805–1990 MHz 40 dBm 2 dBm / 30KHz (min)
CH5 PHS / Mobile 2G 4G / Unicom 4G / Telecom 4G 1805–1990 MHz 40 dBm 2 dBm / 30KHz (min)
CH6 3G / Mobile Unicom Telecom 3G 4G 2010–2170 MHz 40 dBm 2 dBm / 30KHz (min)
CH7 3G / Unicom Telecom 3G 4G 2110–2170 MHz 40 dBm 2 dBm / 30KHz (min)
CH8 4G1 / Mobile 4G (indoor coverage) 2300–2400 MHz 40 dBm 2 dBm / 30KHz (min)
CH9 WIFI2.4G / WIFI5.8G 2400–2483 MHz / 5725–5850 MHz 37 dBm 2 dBm / 30KHz (min)
CH10 Mobile 4G 5G 2500–2600 MHz 39.5 dBm 2 dBm / 30KHz (min)
Mobile 4G 5G 2600–2690 MHz 39.5 dBm 2 dBm / 30KHz (min)
CH11 5G1 / Telecom 5G 3300–3500 MHz 39 dBm 2 dBm / 30KHz (min)
5G2 / Unicom 5G 3500–3800 MHz 39 dBm 2 dBm / 30KHz (min)
CH12 5G2 / Mobile 5G (indoor coverage) / WIFI5.2G 4800–4960 MHz / 5150–5350 MHz 37 dBm 2 dBm / 30KHz (min)

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