As a loudspeaker professional, WING CHEONG does provide speaker models complying with the following approvals/ standards
![UL](upload/content_images/wingcheong_website_content2016041374657.jpg)
UL
UL1480 is a standard introduced by Underwriters Laboratories, which provides speaker standards for fire alarm, emergency and commercial and professional use.
![EN](upload/content_images/wingcheong_website_content2016041384527.jpg)
EN
EN standard, carried out by independent standards bodies, acting at national, European and international level.
![ISO9001, ISO14001](upload/content_images/wingcheong_website_content2016060711944.jpg)
ISO9001, ISO14001
Factories of WING CHEONG are accredited for ISO9001 (Quality Management) & ISO14001 (Environmental Management System).
![ULC](upload/content_images/wingcheong_website_content2016041333883.jpg)
ULC
CAN/ULC-S541 standard, introduced by Underwriters Laboratories of Canada, is a standard for Speakers for Fire Alarm Systems.
![RoHS](upload/content_images/wingcheong_website_content201604139678.jpg)
RoHS
The Restriction of Hazardous Substances Directive (RoHS) 2002/95/EC was adopted in February 2003 by the European Union and was effective on July 1, 2006.