In large exam halls, traditional invigilation is no longer enough. Mobile phones, smart watches, and wireless earbuds enable real-time, hidden cheating that cannot be detected by human supervision alone.
Without effective electronic control, large venues face unfair exams, compromised results, and serious reputational risk. A professional, venue-wide anti-cheating solution is now essential.
With over 21 years of R&D and production experience in information security protection, we provide comprehensive signal control solutions to ensure exam integrity and smooth operations:
Exam Fairness & Coverage Consistency:
Seamless integration of omnidirectional and directional units delivers full-hall coverage, eliminating blind spots and guaranteeing equal conditions for every candidate.
Effectiveness in Real Exam Environments:
Proven to perform reliably even near strong signals and through complex structures, ensuring consistent results across all exam settings.
Controlled Impact on Surrounding Areas:
Precision-targeted deployment confines signal control to exam spaces, avoiding interference with adjacent classrooms, offices, or public areas.
Stability for Long-Duration, High-Stakes Exams:
Engineered for continuous operation without overheating or dropouts, ensuring uninterrupted exams from start to finish.
Adaptability to Large and Diverse Exam Layouts:
Modular, flexible deployment adapts to large classrooms and lecture halls of any layout, eliminating repeated investment for each venue.
Supplier Reliability & Long-Term Support:
Work with a trusted manufacturer offering ongoing technical support, maintenance, and customization, ensuring long-term, dependable use.
Compliance, Control & Manageability:
Designed for authorized use with full operational control, fully aligning with institutional policies and management requirements.
The N-14-120W operates by generating RF signlas within a designated zone. When activated:
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.
Ensure fairness in examination halls
Maintain order and security
Maintain confidentiality
1. What frequency bands can your products block? Does it support 5G?
Our devices support full-spectrum mitigation, 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 jamrs remain effective even under extreme interference levels from nearby base stations.
4. Will the mobile phone jamrs affect other electronic equipment, like projectors or microphones?
No. Our phone jamrs 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 mitigation distance (e.g., 8–100 meters) based on your actual environment.
6. Will multiple omnidirectional jamrs 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 jamrs 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 phone jamrs 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.
| 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℃ |
| 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) |
Germany
This is our second time ordering the the cell phone blockers from this company, and we are very satisfied. The shielding performance is excellent, and both the industrial design and cooling system are impressive. Mr. Chen is always friendly and replies quickly—often within an hour, despite the time difference. This supplier has our full trust. Confidently recommended for any organization needing high-quality signal blockers.
Indonesia
We've been using the N-14-120W signal blockers for our examination venues for years, and the performance is excellent every time. Shipping to Indonesia is surprisingly fast, often ahead of schedule. The supplier is very reliable, always quick to answer our technical questions and adjust settings for different venue sizes. They even confirm the specifications before shipping. The equipment is always well-packed and arrives in perfect condition. 100% RECOMMENDED! Ask for Chen—he provides fantastic support.
Canada
The N-14-120W blockers we ordered work perfectly! 📶 The shielding is strong and stable, and the build quality is excellent. Communication with the technical team was smooth and professional, making the whole process easy. We also received a performance report before bulk order, which gave us full confidence. Will definitely order more for our meeting rooms. Thank you!
United States
I'm very satisfied with the DescBoost cell phone blockers we deployed. Mr. Chen is an excellent support engineer—helpful, professional, and very attentive to our site requirements. The equipment performs flawlessly in our conference rooms, and shipping was fast. Highly recommend working with him, and we will definitely purchase again.
United States
Delivery was slightly delayed due to customs, but once we received the N-14-120W units, we were impressed by the build quality. The heat dissipation and signal stability are excellent, and performance exceeded expectations. The devices are professional, durable, and ideal for our secure facilities. Tested under full load, and they performed perfectly. Very satisfied and planning a larger order. Highly recommended supplier.
United States
The shielding effectiveness, build quality, and packaging are excellent. The devices look professional and work very reliably. Planning to make them our main supplier for all secure meeting venues. 💖
United States
Just received the blockers and they all look robust and perform beautifully 💪 The signal blocking is always consistent, and the pricing is very fair. This supplier has been reliable every time—highly recommend! 🤩
Germany
The N-14-120W units work great, and the directional adjustment feature is very useful. The engineer Chen was very professional, offered excellent advice, and helped us optimize the antenna setup for maximum coverage. Extremely happy with the result and will order more if needed. Thank you!
United States
Very satisfied with the K-14-80W blockers—will be placing another order soon. They work perfectly in our training centers. We even customized the frequency ranges to match local networks, making the solution feel unique and tailored. 🙂
Vietnamese
We needed a reliable solution to block unauthorized communications used by inmates to smuggle contraband or coordinate escapes and to prevent sensitive information leaks during meetings. This signal blocker exceeded our expectations! Not only is it high-powered, but it also allows precise adjustment of power and frequency. Its unobtrusive design delivers exceptional effectiveness. Once activated, there are no signal blind spots and no risk of information leaks—exactly what we needed for enhancing prison security.
Canada
We installed this signal blocker throughout our prison, and it immediately enhanced our security measures. Its precise, adjustable power settings let us customize coverage exactly where it’s needed. By blocking all mobile and wireless signals, we have effectively reduced the risks of attacks and violence. It has become an indispensable tool for protecting the integrity of our facility.
South Africa
As a prison security officer, I had doubts at first about how effective the signal blocker could be.However, this high-power phone blocker has exceeded all my expectations. Even near strong cellular base stations, it consistently maintains full effectiveness. It’s perfect for supporting comprehensive, multi-layered security protocols. Truly a professional-grade solution tailored for correctional facility security.
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Click Email to boster.chen@gmail.com
