MJ-400G fanless desktop cellular and Wi-Fi jammer — MJ-400G · Fanless desktop jammer

MJ-400G · Desktop jammer

Fanless Desktop Jammer for Cellular and Wi-Fi Signals

Independent band controls and adjustable output power in a quiet desktop unit. The MJ-400G uses a fanless metal chassis for continuous operation, with cellular and Wi-Fi/Bluetooth options selected when ordering.

Fanless design eliminates cooling-fan noise.
Adjustable power and separate on/off controls for each band.
Designed for 24-hour operation on external power.
Frequency options configured to your requirements.

Product code: MJ-400G

Contact Us for Pricing

Tell us where you plan to use the unit and which frequency bands you need.

Free consultation, training and support.
Speak to our team: +39 080 302 6530

For law enforcement only, on request.
Check the regulations applicable in your territory before requesting information.

Product overview

Quiet Operation. Individual Band Control.

01 / COOLING

No Cooling-Fan Noise

The metal chassis dissipates heat without fans, supporting quiet desktop operation.

02 / CONTROL

Adjust Each Band

Use the power regulator and individual on/off controls to manage the configured frequency bands.

03 / POWER

Continuous External Power

The included 5 V / 12 A power adapter supports AC 110–240 V input and extended operation.

Product details

Full description

Configure the Bands You Need

The MJ-400G is a desktop jammer for the listed cellular and wireless frequency options, including GSM, 3G, LTE, and Wi-Fi/Bluetooth. Each configured band has an individual on/off control, with adjustable output power.

All frequency bands are optional. The supplied configuration table lists 4G and Wi-Fi as fifth-band options, so confirm the required combination when ordering. The table does not establish simultaneous support for every listed option.

Fanless Cooling for Quiet Spaces

The metal chassis provides heat dissipation without cooling fans. External power supports 24-hour operation, including use on a 220 V AC supply through the included adapter.

The description lists a 25–30 meter operating range. The specifications state up to 40 meters where the local signal level is ≤ −75 dBm. Actual coverage depends on signal strength in the area.

Technical specifications

General specifications
Total output power	Up to 12 W
Power supply	AC 110–240 V / DC 5 V, 12 A
Operating radius	25–30 meters stated in description; up to 40 meters at signal levels ≤ −75 dBm
Device weight	1.8 kg
Package weight	2.8 kg
Device dimensions	200 (L) × 165 (W) × 60 (H) mm
Package dimensions	460 (L) × 245 (W) × 90 (H) mm
Included accessories	Omnidirectional antennas and 5 V / 12 A power adapter

Optional frequency bands — values as listed in the supplied specifications
Band	Frequency (MHz)	Channel output (W)
GSM900	925–960	3
1805–1880 MHz	1805–1880	1.5
3G	2110–2170	1.5
791–826 MHz	791–826	2
4G · optional fifth band	2620–2690	2
Wi-Fi · optional fifth band	2400–2500	1.8

Usage and restrictions

For Authorized Agencies

For use by authorized government agencies and law enforcement in the course of their official duties.

Sales and use are subject to local restrictions. Confirm the requirements in your jurisdiction before requesting product information.

Expert Support, Included

Before You Buy

Talk with our team about your requirements and available configurations.

After Your Purchase

Get help learning the equipment and answers to your product questions.

Technical support

Work directly with the Endoacustica team for technical assistance.

Contact our team

Request an MJ-400G Quote

Share your agency’s requirements. We’ll help confirm the configuration and provide pricing.

Or call: +39 080 302 6530