Immediately block the cell phones once the Jammer is switched on. No need to wait! More efficient than other jammers!
*2.8KGS Only
*Dimension-33X27X12CM
*Jamming Disntance≥15 meters typical @ ＜-85
dBm base station signal
*Directional antenna inside
*Frequencies are based on your requirements

https://youtu.be/LdDV2AKyCgQ