A cellphone jammer（https://www.jammermfg.com/cell-phone-jammers.html） is a device specifically designed to interfere with cell phone signals. It mainly blocks calls and text messages from surrounding mobile phones by sending a signal at a specific frequency. This kind of equipment is usually used in some special occasions, such as military bases, prisons, conference rooms, etc., to prevent people from using mobile phones to cause information leakage or other security risks. The working principle of a mobile phone signal jammer is to block mobile phone signals by sending interference signals so that surrounding mobile phones cannot communicate normally.

A bluetooth scrambler（https://www.jammermfg.com/wifi-jammer.html） is a device designed to interfere with WiFi signals. It mainly prevents surrounding devices from connecting to the WiFi network by interfering with the frequency or signal of the wireless network. This kind of device is usually used in some public places or corporate internal networks to prevent unauthorized users from connecting to the WiFi network and causing data leaks or other security issues. The working principle of a WiFi jammer is to block WiFi signals by sending interference signals so that surrounding devices cannot connect to the WiFi network normally.