https://www.thejammerblocker.com/p-us-044-portable-gsm-and-bluetooth-signal-disruptor-4-bands/
Compact 3G Phone and WiFi Blocker P-US-044
167.84$

Need to silence your phone and disconnect your WiFi in certain situations? Meet this 4-band portable GSM and Bluetooth Signal Disruptor with fan.

It is low-key and quiet when running, but it has strong execution power – it fundamentally blocks the signal transmission between devices operating in the CDMA, PCS, 3G, and WiFi2.4G bands and base stations.