The CJAM 1000 bomb beater. This, is an über powerful portable cellular jamming device that lets you stop pagers, cell phones, wi-fi or any other microwave frequency for up to 1 km around your location. You can activate it remotely and it comes with a fingerprint option to prevent little Johnny triggering it at an inopportune moment.
"The CJAM 1000 is a powerful advanced jamming device that utilizes unique and intelligent techniques interfering with communication along up to 3 frequency ranges specified by the customer. Choice bands include Cellular, GSM 900, Paging, PCS, Wi-Fi or any other Microwave frequency."