* 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 to 4 hours talking time, or 48 hours Standby time Package includes -1 X smillest card GSM based1X standard earpiece ( works upto 3 to 4 hrs with a single cell )2X earpiece cell model number 3141X charging cable.
 
Cautions - 
Don't use this earpice for longer time. 8 to 9 hrs is maximum use time since it's electromagnetic ways might harm if exposed for longer durations. 
Never sleep with earpiece in your ear
Do not insert forcefully. Don't push the earpiece as they might harm your ear canal/drum. 
The buyer shall not use the product for any illegal purposes and shouldn't permit anyone to use the product in any kind of unlawful activities. We promote our products for betterment for our lives not to go against law, or humanity.