GP-B4 Pocket Black Box GPS GSM Signal Jammer with 4 Hidden Antennas

Compared to the G9Pro, our GP-B4 can be charged in a car via USB charging cable or used directly with a power bank, greatly improving its flexibility.

The GP-B4 mini black box design keeps everything minimal on the outside, while integrating 4 built-in concealed omnidirectional antennas inside the chassis. No external protrusions, no complex setup—just a clean, discreet form that blends easily into mobile or stationary environments.

Inside, this palm-sized GSM signal jammer is engineered for four-band operation at 1.2W total output power, targeting multiple navigation and communication frequencies including:

Another highlight is the integrated 2000 mAh NiMH battery, delivering approximately 100 minutes of runtime. A clear blue LED indicator shows charging status at a glance, removing any guesswork during operation.

And yes—it supports charging while in use, which makes this pocket GPS tracker blocker far more flexible in continuous-use scenarios. The low-power communication design also helps keep thermal output under control, so performance remains stable over time.