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signal jammer

https://www.jammermfg.com/8-band-portable-cell-phone-jammer-jams-2g-3g-4g-gps-wifi-lojack-frequency.html
The most popular 8-antenna portable Mobile Phone Jammer can block CDMA and GSM, DCS and PCS, 3G, 4G, WIFI 2.4G, GPS, LoJack frequencies within the effective shielding range of 5-30M. Independent frequency control switches can make you turn the frequencies you want to jam on or off as needed. The operation is simple and the applicability is high. It is a handheld jammer that is widely praised by most users.
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