Surveillance is the monitoring of the behavior, activities, or other changing information, usually of people and often in a surreptitious manner.
Surveillance most usually refers to observation of individuals or groups by government organizations, but disease surveillance, for example, is monitoring the progress of a disease in a community

A Wifi Jammer is designed to block wireless land networks and bluetooth connections. The wifi/bluetooth jammer transmit electronic waves in 2.4~5.9GHz, and cut-off all Wireless network and bluetooth communications. This little device has the potential to jam wifi and Bluetooth signals. A wifi/bluetooth jammer could helps people to prevent from unauthorized person to “leak” out [...]

Portable Video Breaker/Jammer 900mW utilizes unique and intelligent technique that interferes the 900MHz, 1.2G Hz and 2.4 GHz signal of wireless spy camera, anti wireless spy camera & body bug. Portable Video Breaker/Jammer can be used at the place where photography is strictly forbidden, Meeting room /Hotel/ Casinos /Dressing room/ Anti-peeking/ ATM. Its Ni-H DC12V/1600mA/h [...]

This handy, pocket-size mobile transmission detector can sense the presence of an activated mobile phone from a distance of one and-a-half meters. So it can be used to prevent use of mobile phones in examination halls, confidential rooms, etc. It is also useful for detecting the use of mobile phone for spying and unauthorized video [...]

Outdoor Wi-Fi 11a.b.g Jammer device camouflage looks like the panel antenna or WiFi outdoor device. Wifi 11a.b.g jammers transmits power radio signals to cut off communications between PC or cellular phone and base stations without interfering with any communication.   Features and Specifications Tx Frequency: 2.4~2.5GHz, 5.1~5.9GHz Cover interface standards: 802.11 a/b/g Total output power:EIRP [...]

Mobile Bug Detector This handy, pocket-size mobile transmission detector can sense the presence of an activated mobile phone from a distance of one and a half meters. So it can be used to prevent use of mobile phones in examination halls, confidential rooms, etc. It is also useful for detecting the use of mobile phone [...]

Electronically speaking, cell-phone jammers are very basic devices. The simplest kind has just an on/off switch and a light to indicate it’s on. More complex devices have switches to activate jamming at different frequencies.  The main components of any jammer are its antenna, electronics, and power supply. Antenna — Every jamming device has an antenna [...]

Bluetooth and most WiFi signals operate on the 2.4 GHz band. Most everyday cordless phones work on the same 2.4GHz frequency. Therefore, with a little tweaking you can turn a cordless phone into a Bluetooth and WiFi jammer. (This device will only jam WiFi routers that operate on the 2.4GHz band. Routers that use 3.7Ghz [...]

A cell-phone jammer transmits radio signals to cut off communications between cell-phones and their networks.  If you activate a phone jammer, all idle phones nearby will indicate “NO NETWORK.” Incoming calls are blocked, as if the cellular phone were off. When the phone jammer is turned off, all cell-phones will automatically re-establish communications and provide [...]

While the law clearly prohibits using a device to actively disrupt a cell-phone, bluetooth, or WiFi signal, there are no rules against passive blocking of necessary transmissions. That means using things like wallpaper or building materials embedded with metal fragments to prevent cell-phone or WiFi signals from reaching inside or outside the room. Some buildings [...]