GSM Spy Auido Buy with Voice Detecting Callback

Highlights
Super long standby, voice call back, precise positioning, flashlight

Specification
Audio : Super-sensitive audio surveillance.
Micphone Range(meters) : 5~7(Radius), 4 levels
Power supply : 24 hours non-stop power supply.
Compatible : GSM / SIM Frequency: 900, 1800, 1900MHz 
Receive Sensitivity : -+10K
Work Temperature : -40~50'C
Responding freqency : 1.2K~800Khz
Stand-by time : 7 days
Working time : 4 hours
Accessory : Power adapter x 1,Usb cable x 1,User manual x 1