In this mini (like a matchbox) device (бръмбър ") may be tapped through a SIM card for GSM, which is placed in the device. You can tap any call, simply by dialing a GSM number, wherever you are in the world you are, but provided coverage of the GSM network. World of the red indicator light on the device side, which put the SIM card and then goes out, it means that the mini microphone is in standby mode. Place the device where you want to tapping what is happening in a given area (within 10 m). After dialing the number of line card device opens automatically. In the phone call did not issue the microphone is turned on, ie inclusion of listening is completely discrete. Card that is placed in the device must have a "PIN" and a voice mail can be automatically activated, and then call in to activate the microphone. Notwithstanding its small size may work listening a long time (7-8 hours) with a single battery charge. In standby mode, about 7 days. Compatible with cards MTel, Globul and Vivatel and GSM 900/1800 networks, or 1900 MHz. In the appliance is built-in rechargeable battery that is loaded from a computer or contact with samonavivasht through adapter is a USB cable. Try different cards and GSM, while determine under what conditions is heard (listening) best. You can use SIM cards in one group. The dimensions of the tapping device are: 5,2 x3, 7h1, 5 cm GSM network operates at 900/1800 or 1900 MHz.