This signal jammer is equipped with 14 antennas and LCD display, which can block multiple signals such as 5G, GPS, WiFi, Bluetooth, etc. within a range of 2-25 meters. You can wear it on your arm or put it in a backpack - its 2-3 hours of battery life can protect your safety anytime, anywhere. Simply flick the switch to control each frequency band, ensuring you have absolute privacy when taking exams, meetings or performing tasks!

https://www.jammermfg.com/best-selling-classic-black-portable-14-antennas-5G-cell-phone-signal-jammer-with-lcd-display.html

Other ideas: https://www.jammermfg.com/5G-jammer.html