With any sound or shock occured, you will receive its calling and can decide to spy or not.
At the same time, you can adjust the three gear sensitivity to get more qualified call connection.
This GSM Audio Spy Bug Surveillance Device requires the insertion of a SIM card prior to operate. It enables the user to remotely listen to anything in the vicinity of the bug .
Embed mini microphone with 4 bands adjustable and sound control callback function
Easy to set-up
Compatible to all standard GSM SIM cards
3 phone numbers can be set
Built-in phone number filter function, only pre-set number can detect
Sound control callback function: will not spy when nobody present