Block cell phone signal in classroom - what is a cell phone signal blocker

up to 2 Hours Continuous Use on Full Charge, Jamming for CDMA/GSM/3G Cellphone, Mini-Pocket  Mini-Pocket Tri-band GSM/3G Jammer  Model :PK310 Brief Description： PK10 signal jamming blocker will fit in the palm of your hand or comfortably in your pocket. It didn’t has external antennas and is smaller than the typical cell phone. Slip this into your purse or pocket and enjoy a quiet commute or theater experience.  Discreetly create a quiet zone around yourself and enjoy your meal, movie or performance. Purchase your phone blocker today and enjoy renewed privacy and peace and quiet. Features: ●Effective for GSM / CDMA / DCS / PHS / 3G up to 10 meters (30 feet) ●Up to 2 hours continuous use on full charge ●Standard Nokia type battery (included) ●Standard Nokia type chargers ●Outlet charger (included) ●Car charger (included) ●North American / European specific models (model shipped based on    destination country) ●Highly portable and concealable ●Light is red while charging, green when in use ●Automatic shut down to avoid overcharging One of the most fully featured and highly portable blockers available anywhere. Applicable place:  For car, truck, bus, van, or even boat security, stop GPS tracking signals For meeting rooms, conference rooms, museums, galleries, theatres, concert halls, churches, temples, restaurants, classrooms, training centers, factories, banks, hospitals. Order information : Model :PK310 jamming for CDMA/GSM/3G cellphone Specification: Working Frequency:  CDMA 850MHz-894 MHz                                                                                                                                                                                 PCS 1900MHz-1990MHz      3G 2110MHz-2170 MHz Working voltage: 110V-240V/50Hz-60Hz.DC5V/0.8A  Coverage radius: 1-10M Average out-putting power: 27dBm each band Total output power: 1.5W Jamming Range: radius 2~10M (Signal≤-85dBm) depending on the mobile service provider’s network condition Power supply: AC adapter (AC110V-240V  DC5V) ,Car power charger Operate time by battery: 2hours Built-in Battery:1500mA/h Power consume:0.54W/h      Antenna: internal 3pcs omini-directional    Packing information: Neutral gift packing Dimension of the Main Part:  95 (L)×45(W)×18(H)mm Package Size: 195(L)*135(W)*57(H)mm Weight:150g Gross Weight: 350g Package contents:  1pc jammer body 1pc battery  1pcs wall charger  1pcs car charger   

block cell phone signal in classroom

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