what can block a wifi signal

.... Product Introduction This portable handheld er can effectively within a radius of 5-20 meters. It has two mode...

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Product Description: jammer that can only the 2.4G, but also at the same time can other frequency bands at the same t...

Adjustable 8 Bands 20w High Power Wifi Signal Jammer Blocker Cell Phone Signal Jammer Supplier With 1 Year Warranty! Frequency Can Be Customized! Spec...

...Jamming range 5 to 20 meters(@-75dbm,depends on strength in given area.) *Hand-haled design,plam size,similar to cell phone or Walkie-Talkie...

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... Jammer GSM CDMA 3G 4G 1. Introduction EST-808P mobile phone jammer, is able to GSM/CDMA/AMPS/DCS/PHS/3G(WCDMA)/4G, 2.4G WI...

Four Antennas Portable Jammer for Mobile Phone s And Wi-Fi/GPS Description: Portable Black color 4 bands cell phone jammers with 4pcs Omn...

..., 2g/3G/4G and LOJACK GPS Model: CKJ-2001SN8 Color: Black Basic Specifications Jam Type:1: CKJ-2001SN8: Full Bands Mobile...

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Absolutely new modern service is available for you with a new GPS signals jammer - a GPS jammer which can block any GPS signal and actually make you p...

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... Jammer Product Introduction We are a professional High Power 60W 12 Channel 50 Meter Radius Mobile Jammer manufacturer and ...