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.

Configure the Bands You Need

The MJ98-400G 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.

Total output power	Up to 12 W
Stromversorgung	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