Features:

1, smallest size in the worldwide
2, Noneed extra power for long standby time
3, Support works in USA
4, No buttons,just plug SIM card inside will power on and get it works automatic
5, Built in GSM communication module
6, Works for Europe,Asia,Middle East and Africa

GSM Remote Spy Audio Monitor with SIM socket Specification:

1, Frequency: 850mhz,1800mhz/1900mhz
2, Working range: 5~10 meters
3, Support for all GSM SIM card
4, Standby time: 15days
5, Built in 300mah Li-battery
6, Mulriple charger plug for your choose, EU,Asia,UK

Package:

1 x GSM remote spy audio transmitter
1 x Charger
1 x USB cable
1 x Package