Product link: www.lightinthebox.com [US.14] Use this portable device to create a temporary cell phone traffic “dead zone”. Once turned on, all cell phones within a 0.5 to15 meter radius of the device will not be able to make or receive phone calls. Attention: The use of jamming equipment is prohibited in some countries. It is the responsibility of the customer to ensure that they have the legal right to purchase this product before buying it from LightInTheBox.com. Upon purchasing, the customer becomes wholly liable for any legal issues that may occur as a result of the importation and/or use of this product in any given country.