It's a complete set of Bluetooth Mask and a Spy earpiece - MICSPY Earpiece. Battery backup is 4 to 5 hrs and the sound quality is very good. Battery backup of earpiece - 4 hrs per cell Charging time - 2 to 3 hrs. Phone to mask distance - 10 M is best.
 
To use the electronic earpiece your ear canal has to be clean so that the small electronic earpiece could smoothly go inside the mid canal of the ear properly and safely. This electronic earpiece has cells inside, and the battery life of these cells are 4 hours. The cells need to be replaced after their life. Electronic earpiece are slightly bigger in size compared to magnetic earpiece and are louder than magnetic earpiece.
 
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 magnetic 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.

Inside package - 
1 X mask 
1 MICSPY earpiece with two cells or  Magnetic earpiece with a stick (As per customer's selection)
1 X charging cable and charger

BATTERY BACKUP DEPENDS UPON THE MODEL YOU CHOOSE. 

For any more help please chat via WhatsApp at +91 9774638866 .
Thank you