Hefei youwang electronics co., ltd. main management YW-03D SURGE PROTECTIVE DEVICE. The instrument corresponds by letter the profession standard according to the People's Republic of China <always go together with the line > (YD/T 694-2004), the People's Republic of China correspond by letter the profession standard <the communication equipments conduct electricity to press a protection to use the semi-conductor tube > (YD/T 940-1999), the People's Republic of China nation standard <the communication equipments conducts electricity to press a protection to use the air turns on electricity to take care of an in general use technique condition > (GB/T9043 - 1999)medium provision of on trial norm, depend on the main examination item of the public security unit according to the step of the enactment this completes various purpose tests.