GSM BOX GSM BIG SIM Card with Hidden In Ear wireless 218 earpiece Earbud spy Kit New items , new design .. the battery has changed into 550 mah Calling time 3.5hrs MT6261 low power consumption,noise reduction technology guarantee Suitable for BIG Card Package/List of Accessories:1 x GSM BOX 1 x USB charger cable1 x Original Maxell 337 battery which work up to 8 hours1 x Earpice 218 PRODUCT DESCRIPTION Once insert a GSM SIM Nano 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 networksOptimized inductive coil creates strong power for earpieceSize:35*50*13mm Weight:96.5gramIMEI Unique New GSM Box No problem in any country(Can write IMEI for you for India and Turkey)3.5 hours talking time, or 48 hours Standby timInduction distance to earpiece 30-80 cm HOW DOES GSM BOX WORKS?The new developed GSM BOX has a buildin 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 40-60cm distance.One pc 35db top sensitive microphone ensures your partner hear the whisper voices, even the GSM BOX is hidden under the clothes.GSM BOX has a builtin rechargeable 500mAh battery. supports more than 3.5 hours talking time, or 8 hours Standby time