NO Bluetooth NO GSM it works on Radio Wave !
How it works:
It works similar to the walkie talkie but instead of two wireless hand module their will be one Lunchbox and one hand module. 
Features:
It will work upto 10 kms without any disturbance with clear voice.
It can work under a jammer also.
In the box:
1x LUNCHBOX
1x CHARGER 
1x USB charger cable 
1x Operating Manual 
1XWarranty Card 
1x Hand module (walkie talkie)
*** Include an Standard earpiece, one battery work 3-5 hours. If you need over 24 hours, please buy special pro earpiece 
FULLY INVISIBLE AND HIDDEN: