Safetynet Two Sided Spy GSM Master Card Earpiece, 4G NA Voice Recorder  (0 inch Display)

once insert a gsm sim card and turn on the power, it will automatically pick-up calls from any mobile phone or telephone. Two way covert communication via mobile phone networks optimized inductive coil creates strong power for earpiece size 85*50*4.5 mm 3-4 hours talking time how does it work. the new developed gsm box has a built-in dual band gsm module that works in both of four band mobile phone networks. Once insert a gsm sim card and turn on the power, it will automatically pickup calls from any mobile phone or telephone. The powerful inductive coil will creat strong signals to drive earpieces within 40-45cm distance. One pc 35db top sensitive microphone ensures your partner hear the whisper voices, even hidden under the clothes. Gsm box has a built In rechargeable 650mah battery