NO Bluetooth NO GSM it works on Radio Wave!
How it works:
It works similarly to the walkie talkie but instead of two wireless hand modules, there will be one Underwear and one hand module. 
Features:
The range is not huge. It's from 100 meters to 1000 Meters maximum and varies from location to location. 
It can work under a jammer also.
In the box:
1x Underwear
1x CHARGER 
1x USB charger cable 
1x Operating Manual 
1XWarranty Card 
1x Hand module (walkie talkie)
*** Include a Standard earpiece, and one battery work for 3-5 hours.