Jammer box complete set 128 Channel - radio-based 
Range from 100 meters to 1 KM maximum 
Works perfectly with GSM network blocking devices. 

How to Operate - 
Charge both of the devices for 3 hours 
Keep the same channel for both the hand radio and earpiece Transmitter 
Now press PTT Switch for working 

The Earpiece will connect automatically. In this model, only electronic Earpiece can work,
Magnetic earpiece will not work.