key switch ( lock box ) 1)Specialized for Anti-theft rolling door motor ... )With CE,CCC,ISO9001,ect The size of the key switch ( lock box )is about 15*9*5.5(cm) and ... (contain clutch line) ;Adopt Manual operation;When the remote control can't used,you can use key switch for opening roling door ... future.Best regards, ----ZhangZhou JinAn Electric & Machine Co.,Ltd. Stainless manual Key switch ( lock box )