... simultaneously, and has a maximum overall RF TG-Portable Multi band Cellphone Portable Jamm Cover interface standards:GSM800-900:850-960MHz GSM1800 ... separately. 2. This jamm with pelican case can add band frequency as customer's requirements. 3. It can be ... jamming range and band frequency can be adjusted. 5. Use Pelican case, waterproof, shockproof, irrefrangible, dustproof and portable. 6. Two ...