We are offering gsm detective :

- The GSM phone line interceptor is a tri-band phone and 'bugging' device which monitors all outgoing and incoming land line calls and transmits the conversation to your desired phone using the inbuilt GSM module. It also auto-detects voices in a room and will transmit the conversation using its super sensitive microphone. It gives you 72 hours of standby mode and 3 hours talk from one charge of the internal Li-Ion battery.

* Feature :
- GSM tri band GSM network to make & instant surveillance task possible. No range limitation
- For home phone line security, monitoring all outgoing and incoming phone conversation.
- Auto switch between phone line and area voice monitoring. Phone line is first detected.
- Auto calling when detect phone line in used, can turn on or off.
- Built in high sensitive dual microphone.
- Auto calling when detect voice level in TW-GM1000 area, can turn on or off.
- Auto calling when detect external device input, like infra red sensor alarm, can turn on or off.
- Auto calling when detect shock for TW-GM1000, can turn on or off.
- Dual mode function, can operate independent without phone line plug in, auto detect function, auto switch to phone line monitoring function.
- External microphone input can be used as voice unlimited repeater, transmit using GSM network.
- Low battery SMS sending, and LED indicator flashing.
- SMS control function.
- One touch button operate system
- Built in high capacity LI-ION rechargeable battery.

* Specification :
- Frequency : GSM 900 /1800 /1900MHz
- Siemens module size : 62(L)x40(W)x(20(H) mm
- Weight : 45g
- Life time : 72 Hours (standby mode) 3 Hours (sending mode)
- Battery : 3.7VDC 1200mA (rechargeable LI-ION) Power charge : 5V-6VDC.