Operating sound approximately 50 dB *Quiet design *Measures at a distance of 3.3 ft (1 m) on the front of the main unit. Dust box with window allows you to check the storage amount. Compatible size: A4 size. Maximum shredded number of sheets is 5 sheets of A4 copy paper. Shredded size is approximately 0.2 x 1.1 inches (4 x 27 mm).