This is Quardband Mirco Audio Bugs, Remote Surveillance Listening Device
Example: If you are not home, someone goes to your room with noice, you will be alerted at once through your phone!
Two-way mode sound activated GSM voice bug with Call back function /listening device/audio monitoring
Using 2G GSM SIM Card (just as call to destination mobile phones). Not Support 3G/4G Sim Card!!!
Remote control to turn on/turn off call back function by mobile's SMS only
Unlimited distance & cross-over countries, only if there is GSM singal !