Insert a GSM SIM card into the slot and put the audio bug at hidden place,then dial the card number to monitor your target,you will hear the sound arround the bug.(5-15m range)

Features:
Super-sensitive audio surveillance.
Embed four condense microphone.
24 hours non-stop power supply.
All GSM SIM card compatible.
Specification:
Frequency:900, 1800, 1900
Power Supply:24 hours Non-stop
Card Compatible:GSM / SIM
Microphone Range (Meter):5~7(Radius), 4 levels
Receive Sensitivity:-+10K
Working Temp:-40~50'C

Accessories:
1 x GSM SIM Audio Surveillance Device
1 x Charger
1 x USB Cable