How to block cell phone signals legally - how to improve cell phone signal

Full Band Jammer for GPS/ 3G/4G Cellphone GPS Tracker GPS/Glonass/Galileol1-L5 Jammer  High Power Portable 6Bands Jammer/Blocker Vodasafe P6plus Brief Description： High power Vodasafe portable jammer P6plus is updated version of P6, it can effectively block CDMA,GSM,3G UMTS,4G LTE cellphone,GPS,Wi-Fi/Bluetooth and we could customize the combination models that includeLojack,it could block all types of Android phones, Tablets, Smart Phones, iPhones, Win phones etc. This portable jammer could work for wireless 2G, 3G, 4G, WiMax, Wi-Fi, Bluetooth,GPS Lojack signals,you could choose this model that will be work stably and reliably.The blocker could create a quiet zone around you and prevent leaking of information in sensitive areas. Features: * Compact Size and easy carry * Each band can turn ON/OFF without influencing the other bands operation * Rechargeable powerful battery  and can be used outdoors * Good cooling system can working long time  * Could be used in Vehicle directly, With car charger for mobile using * Support use while battery charging * Only interfering downlink and no interception on the base station. Applicable place:  For car, truck, bus, van, or even boat security, stop GPS tracking devices For meeting rooms, conference rooms, museums, galleries, theatres, concert halls, churches, temples, restaurants, classrooms, training centers, factories, banks, hospitals. Specification:  Total Output Power:4.2Watt Cover Radius: 5-30m(under Signal level ≤-85dBm)@according to the signal density mobile network Jamming type: Sweep Jamming Antenna Type: 2.5db high gain omni-directional antenna   Power Supply: Rechargeable lithium Battery /AC adapter (50 to 60Hz/100 to 240V AC-DC12V) and 12V car charger  Built-in Rechargeable Lithium Battery: 6000mAh/7.4V Working time of Battery: 2.5-3Hours Electric Filed (SAR): Compatible with ICNIRP Standards (Human safe) Operating Temp:-20 to +50℃ Storage Temp:-40 to +60℃ Humidity: 5%-80% Dimension(LXWXH): 177.5*76.5*36.5mm not include antennas Inner box Dimension:220x202x65mm Weight:1.2kg Order Information : P6plusB jamming for Fullband GPS/Glonass/GalileoL1-L5 tracking device/Lojack/Wi-Fi   1 . Lojack:173MHz  0.7W  2 . GLONASS GPS L2:1220-1260MHz  0.7W  3 . GPS L3 L4:1370-1380MHz    0.7W  4 . GLONASS GPS L1:1570-1620MHz 0.7W  5 . GPS L5:1170-1180MHz 0.7W  6 . Wi-Fi:2400-2500MHz 0.7W   Total: 4.2W Package contents: 1pcs Portable Signal Jammer 1pcs AC Charger 1pcs Car Charger 6pcs Antenna

how to block cell phone signals legally

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