Description About device: The newly developed GSM BOX has a built-in dual-band GSM module that works in both of Four Band mobile phone networks. It provides two-way covert communications via mobile phone networks. Once inserted a GSM SIM card and turning on the power, it will automatically pick-up calls from any mobile phone or telephone. The powerful inductive coil will create strong signals to drive the earpiece within 60-100cm distance. It has a 35dB top sensitive microphone that ensures your partner will hear even when whispering, while the GSM BOX is hidden under the clothes. The GSM BOX has a built-in rechargeable 650mAh battery. It supports more than 3 hours of Talking time, or 48 hours of Standby time. Size: 85 x 50 x 4.5 mm. Weight: 30g.
