P-J800 High-power cell phone jammer in prisons (800W | 3–5 km coverage)

A metal cabinet on the outside. A high-power RF system on the inside. That contrast is exactly what defines the P-J800 high-power prison signal jamming device.

The outdoor cellular phone blocker covers "GSM, 3G, 4G, 5G and WiFi", handling modern multi-band environments with ease. Looks like a standard outdoor electrical box, it can be installed on outdoor antenna masts, and is especially suitable for sensitive areas such as prisons or military restricted areas. So here's the question: how do I turn it on since it's mounted so high? Don't worry, we provide an infrared remote control for turning the jammer on/off.

At the same time, with up to "800W output power", it supports long-range suppression with with a coverage range of approximately 3-5 kilometers depending on the conditions".

Advantages of the P-J800 Prison Cell Phone Jammer:

• Built with IP65 waterproof and dustproof housing, stable for long-term outdoor deployment.
• Equipped with internet-based remote control functionality, administrators can configure and adjust the equipment anytime, anywhere, enabling system management without on-site presence.
• Includes smart fault alarm system for real-time operational monitoring, If the device is tampered with, damaged, or shows module failure or abnormal temperature, it immediately sends an alert to the monitoring system, keeping the equipment in a safe state at all times.
• Uses VSWR protection circuitry, improving stability under continuous high-load operation.
• Designed to target "downlink signals only" helping minimize interference with uplink communication.

The interesting part is how unremarkable it looks from the outside—yet the internal configuration places it among the more capable high-power outdoor jamming units in its class.

Outdoor Military High-Power Signal Blocke's Specifications:

Jackpot Dimensions: 700*550*300 mm
Power Supply: AC 220V / DC 48V (UPS)
Operating Time: 24/7 uninterrupted operation
Cooling System: High-efficiency aluminum alloy heat sink
Waterproof Rating: IP65