here are jammers on the water sold

Android wireless communication needs to ensure that the carrier is received efficiently enough to complete the communication. A signal jammer is a type of mobile phone that receives the interference signal by generating the same frequency as a mobile phone, in order to disconnect the communication connection between the phone and the base station and destroy the state of the phone reception to achieve the shielding effect. The cell phone jammer power is constant and is accomplished by determining the unshielded space shielding radius attenuation path received at the base station signal level. 

The antenna must be connected and powered first.When the host is prohibited from working, please remove the antenna. The shielding equipment must be placed in a well-ventilated place, and try to avoid large objects to ensure shielding. The remote control presses the key, and the host starts working correctly. Locate the system main system power switch on the side panel and turn it off.Compatible with all the latest radio frequency bands, this is the most powerful signal blocking device and can be used over long distances via remote monitoring. Intelligent remote control technology controls the power output. The remote control range is about 30 meters, which will not disturb others. Please rest assured in advance!

The active power (channel power) is high, the Jammers On The Water radius is large, only the active downlink will be interfered, and the blocking range of the signal jammer is adjustable. It can effectively cut off the communication between the base station and mobile phones or communication suppression equipment Radio waves. To avoid mechanical ignition and stable high integration caused by the switch, please use a slow start circuit design. The purchased shielding system consists of many parts: including the shielding host, remote control, antenna, and AC-DC power supply mounting bar. Carefully open the box during use.