16/05/2013
A spy call back listening device is a perfect audio monitoring gadget that can surveill someone or some place with a GSM sim card inserted in it. When you insert a sim card and call the phone number of the sim card, you can hear everything clearly that happens around this gadget.
It is also sound activated. You can place it in your home, once it picks up any sound, it will call you so you can listen to everything going on around there. Very easy to use.
It comes in a mini-size, near to that of a match box. You can place it in your office/home to know if someone breaks in, you can also put it in your car and track when it may be stolen by others, or it will help you to monitor your baby, etc. It can help you do many things. What’s more, it’s very qualified with competitive price. If you have any interest, please don’t hesitate to request an order.
How to Use
Make sure device has been adequately charged. (Device can last for up to 5 days when fully-charged)
Insert a SIM card with a registered phone line into the Call Bug. If you want the call-back function, make sure the SIM card has been adequately funded with call credit.
After indicator lights go off, fix the call bug at a hidden location.
Anytime you call the phone line in the call bug, you will hear the conversation around that area. If it notices any sound, it will call you.
User manual included.
Features
Call your phone number automatic by voice detect
Frequency: 850mhz,900mhz,1800mhz
Built in high sensitive microphone
Built-in rechargeable battery
Stand-by time over 5 days with voice detect function
All GSM SIM card compatible
Microphone sensitive range: 5~7 square meters
Receive sensitivity: -\+10K
Working temp: -40~50′C
Responding frequency: 1.2K~800Khz
Stand-by time over 8 days without voice detect function
Very portable size. Dimension: 52mm x 38mm x 17mm