... & accessories in China 3) Looks nice window & ready to install 4) Good sales service Upvc Sliding WindowLong time Cooperation ... Siegenia etc).6) Property: smooth slide, simple & convenient operation, easy to install & clean, elegant & popular use.7) Size, Color, ... : Installation supervision and send skilled techincian abroad, if necessary.11)where to use : stadium, office, school, hall, home, outdoor, ...