Product Notes : Look at this gadget, one strong body and 6 antennas; it’s a magical cell phone jammer, which can block all the signals of cell phones like GSM, CDMA, DCS, PCS, 3G and so on. What’s more, it can also block two certain radio frequencies: RF315MHZ & RF433MHZ. Like other jammer products, this 6 Antenna Cell phone & RF Jammer (315MHz/433MHz) is mainly applied at meeting rooms, museums, galleries, theatres, churches, temples, restaurants, classrooms, training centers, factories, banks, trains, bus and some locations of special purpose such as hospitals, gas stations and more. Please do field test first to make sure no interference happened to the normal operation of their equipment and instrument if you are going to purchase it. Move quickly! Features: Good cooling system with cooling fan inside Work non-stopped Stable capability Could be used in car directly,With car charger Note: The jamming distances we mentioned on website are for customer’s reference only. The actual jamming distance will be varied depending on the signal strength and the use location and if full charges, etc.