SJ-004 is a small pocket size cellphone jammer with band setting by PC.

The jammer is designed for personal use. It will help you protect yourself from the threat of eavesdropping via cell phone (even when cellphone is switched off can listen to conversations at a distance of several meters).

In addition, the device will allow you to suppress any activity of cellular phones in the room, thus giving the opportunity quietly and intently to conduct a meeting, a lecture, a spectacle, a examination, a presentation, to defend a thesis etc. Wherever you need to maintain secrecy, SJ-004 will be simply indispensable.