Item no:AT-MT 

最傳統及最經濟之開窗系統
可操控多至十個窗戶
可開啟窗戶達4000mm

Traditional and Economical Opearte to 10 sashes at once.
Window opening as wide as 4000mm

AT-MA
電動多窗戶開窗系統
Electric multi-window opening system

AT-MB
手動開窗器
Manual Chain Box