New research suggests Wi-Fi signals can be used to identify dangerous objects such as weapons, bombs, or chemicals. The new technology penetrates luggage and detect suspicious materials without physically opening bags or violating privacy, say researchers from Rutgers University in New Jersey, USA.
How to avoid metal detectors check out when enter into the examination room? This is most concerned question where many candidates recently explored and searched answers on the web. Because two biggest exams are about to begin in China. Most of the examination sites have installed walk through metal detector doors and hand-held metal detectors.
More and more campus attacks have occurred, seriously hurting students' safety. Dangerous personnel carrying knives, guns, etc. entering the campus is the biggest threat, and we should take action to prevent it in advance. Please install walk through metal detector and handheld metal detector at first.
multizone alarming walk through metal detector door means can detect different area of hidden metals on body, intelligent alarming and find out several place metal threats at the same time.
Why do we have to carry out safety control, why do we have to ban the use of firearms or gun, why can't we carry dangerous tools privately?