Make a call to the hidden microphone and you can instantly listen all conversations, The built-in spy microphone works up to a 25 to 30 meter radius.
Allows the wireless spy microphone to call you when it hears people talking, This feature makes it much more advanced than other GSM audio bugs on the market today
Hot spots: Hidden Audio Recorder with Auto Dialing option, Tri-Band GSM.
Product Notes: When it detects sound, the spy microphone will call to your cell phone, You can charge the spy audio device by connecting the USB charger cable to the power charger and the battery backup is awesome only charge 2 hours maximum and use this hidden microphone upto 4 to 5 days.
Please charge 50 minutes before use