“Wave Bubble” by Limor Fried, (2011)
The Wave Bubble is a self-tuning, wide-bandwidth portable radio frequency jammer. It provides up to 2 hours of jamming (two bands, such as cell) or 4 hours (single band, such as cordless phone, GPS, WiFi, bluetooth, etc). The device is lightweight and small for easy camouflaging: it is the size of a pack of cigarettes.
More information can be found here…