https://www.jammermfg.com/8-band-portable-cell-phone-jammer-jams-2g-3g-4g-gps-wifi-lojack-frequency.html
This jammer can block CDMA, GSM, 3G, 4G, WiFi-2.4G, GPS, LoJack and other network signals within a 30-meter radius. It is equipped with a customizable frequency switch and a stylish heat-dissipating metal casing, making it perfect for use at home, in the office or on the go.
More options: https://www.jammermfg.com/cell-phone-jammers.html
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東京での滞在先をお探しの方 1ヶ月単位でお貸しします。 ..