http://pastport.jp/user/taneer98236/timeline/Newly%20Designed%2012%20Antennas%20Handheld%20Mobile%20Jammer This newly designed 12-antenna portable signal jammer is an upgraded version of 10-antenna, adding 2 jamming channels and more optional frequency bands.https://www.jammermfg.com/newly-designed-12-antennas-portable-mobile-jammer.html ja-JP