FIELD: protection against commercial and industrial espionage. SUBSTANCE: device has case with seat for cellular phone. Case accommodates cellular phone radiation detector and acoustic radiator mounted for conveying noise by masking loudspeaker to cellular phone microphone. Case also accommodates analysis and control processor unit, reprogrammable read- only memory device with data exchange protocol, keyboard unit, display, interface, cellular phone position sensor, and call signal sensor. Analysis and control unit is interrelated with reprogrammable read-only memory device. Acoustic radiator is triggered in this device only in case of out-ofschedule invocation of cellular phone for bugging. EFFECT: improved comfort for cellular phone users and protection against bugging; enlarged functional capabilities of device. 7 cl, 1 dwg
