With this device you just stick your SIM card into the device and attach it underneath a desk or car seat etc. then call the cellular number of your SIM card. Once you've connected, you can listen to the conversations around where the unit has been placed. Perfect for keeping an ear on anyplace you want.This SIM device is a special system designed for covert audio surveillance or monitoring by providing regular mobile phone SIM services.
* Unique design, small frame and sturdy construction encompass the rich SIM technology
* Great product for anti-lost and anti-theft
* Widely used for children, old man while missing or in case of an emergency
* Also good for home, office, car, storage and so on
* Wireless voice transmission, the world's universal, not limited to distance, limited space
* Rechargeable design for long time use