The "Cup" device is designed to protect speech information circulating in the places where the owner of a cell phone is located, in the event of its covert remote activation for the purpose of eavesdropping via cellular communication channels. Protection is provided by automatic acoustic noise suppression of the speech information transmission path during an attempt to covertly remotely activate the microphone of the cell phone handset.
Specifications: The noise level at the location of the cell phone microphone is not less than 100 dB Effective spectrum of the noise signal 250 - 4000 Hz Power supply 2 AAA batteries Continuous operation time from one set of batteries is not less than 8 months