Interphone And Invisible Wireless Earphone Jammer

Main Feature:

To protect someone cheat by hight techninogy such as wakie-talkie,
spyears... in important examations.
Only block the wakie-talkie signal, and do not effect other electronics work
Green and low electromagnetic radiation
Built-in power switcher
Super Easy operation, One button operation.

Technical Parameter:
 
* Effective Working Coverage: 20 metres
* the lower Interphone, the larger block coverage
* Frequency Range:  100-800MHz(Recommend: 400-500MHZ)
* Power: 3W
* Environmental Temperature: - 20 to + 55C
* Comparative absolute humidity: 35-85%
* Power Adapter: DC24V 2A Input
* Size:  13.6X11X2.5mm
* Active antenna size: 19.2X1mm
* Net weight: About 0.5Kg