P-US-J28 Portable 28-Band All-in-One Signal Jammer with Enhanced Cooling Design

Following the release of P-US-30, thejammerblocker introduces the P-US-J28, a next-generation portable suppressor engineered for users who care as much about stability and thermal performance as they do about frequency coverage.

Unlike P-US-30, which focuses on antenna expansion and spectrum extension, P-US-J28 takes a different upgrade path. Built on the proven P-US-027 platform, this model has been structurally redesigned to dramatically improve heat dissipation and long-term operating stability. After extensive real-world testing, users consistently report smoother performance and reduced thermal throttling—placing it closer to desktop-grade reliability than typical handheld Silencers.

28 Bands, One jamming device — Full-Spectrum Control

Despite its compact size, P-US-J28 delivers impressive coverage across 28 independent frequency bands, including:

• Cellular networks: 2G / 3G / 4G / 5G
• Wireless data: Wi-Fi 2.4G, 5G, and Wi-Fi 6E
• Navigation systems: GPS L1–L5
• Radio & control signals: UHF, VHF, LoJack, RC 315 / 433 / 868 MHz
• LoRa and FM Radio

This wide spectrum coverage makes the P-US-J28 a practical choice for personal protection, privacy enforcement, and controlled environments where multiple wireless standards coexist.

The device features a full aluminum alloy housing with integrated fin-style heat dissipation, increasing surface area while improving grip and handling. It is also equipped with four high-efficiency cooling fans to actively manage the internal temperature, so that the system can remain quiet, cool and stable even after long-term use and at a high output power of 28W.

An integrated LCD display provides real-time feedback on battery level and signal strength, so you’re never guessing how the device is performing. Individual DIP switches allow you to enable or disable specific frequency bands instantly, giving you precise control without unnecessary interference.

Despite its performance, the P-US-J28 remains genuinely portable:

• Lightweight, backpack-friendly design
• Supports vehicle operation via 12V car charger
• Can be worn or carried discreetly
• Built-in 12000mAh battery delivers up to 80 minutes of continuous operation

Whether you’re on the move, in a vehicle, or working across multiple locations, this suppressor adapts easily to your workflow.

Technical Specifications :

Total Output Power: 28W
Output per Channel: 1W (30 ±1 dBm)
Jamming Radius: Approx. 2–25 meters (depending on ambient signal strength)
Antenna Type: High-gain omnidirectional antennas
Power Supply: AC 110–240V to DC 12V adapter/ Vehicle power support (DC 12V, ≥10A recommended)
Battery: Built-in 7.4V / 12000mAh lithium battery
Operating Time: Up to 80 minutes (battery only)
Charging Mode: Supports charging while operating (recommended ≤3 hours continuous use)
Dimensions (without antennas): 210 × 132 × 85 mm
Net Weight: Approx. 3.0 kg
Color: Black
Warranty: 1 year

Package Contents of high-performance jammers

• 1 × Portable Signal Blocker
• 27 × High-gain omnidirectional antennas
• 1 × AC power adapter (110–240V)
• 1 × DC 12V vehicle charger
• 1 × Heavy-duty portable carrying case
  • Case size: 340 × 330 × 140 mm
  • Case weight: approx. 2.0 kg
• 1 × User manual

28-Channel Frequency Coverage Table

FAQS

• How powerful is this jammer?
  The P-US-J28 delivers up to 28W of output power, capable of blocking 2G, 3G, 4G, 5G, Wi-Fi (2.4G/5.2G/5.8G/6E), GPS (L1–L5), UHF, VHF, Lojack, 315MHz, 433MHz, 868MHz, LoRa, and FM radio signals. Compared to many portable signal blockers, it offers superior interference strength and reliability across multiple bands.
• Is the P-US-J28 portable and easy to use?
  Yes. Despite its high power and full-band functionality, the P-US-J28 features a handheld design with an ergonomic handle and a lightweight body, making it easy to carry and operate. All antennas are pre-installed, so you can use it right out of the box.
  
• How is its heat dissipation performance?
  The improved cooling system ensures more stable continuous operation than many traditional handheld jammers. Our P-US-J28 uses aluminum finned heatsinks and four high-efficiency cooling fans for heat dissipation.
  What are aluminum finned heatsinks? Simply put, multiple parallel fins increase the air contact area and improve heat dissipation efficiency.
  
• How do I get battery information?
  Its features a clear, integrated LCD display that shows the current battery level and important operating information in real time, allowing you to know exactly when you need to charge.
  
• How long can it last on a single charge?
  80 minutes. This portable full-band blocker is designed for extended operation and features a built-in 12000mAh battery. It can be powered directly from a 12V power source inside a vehicle.
• Are all antennas fully functional and operate independently, capable of blocking only mobile phone signals without blocking other signals?
  Yes. Each of the 28 antennas corresponds to a specific frequency band, allowing for precise control over which signals are blocked, achieving selective interference. Therefore, this product can block only mobile phone signals, including 5G, without affecting other signals.
  This flexible control method is highly suitable for complex signal environments.