With an effective transmission frequencies of 845~975 MHz, 1785~2000MHz, 2100~2170MHz, 2400~2485MHz.It is suitable for small housings, meeting rooms, restaurants, etc. Equipped with a rechargeable Ni-H DC12V/1600mA/h and a universal charger, the portable mobile phone immobilize system can be surely included among the most advanced jamming devices in the world.