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Membrane keyboard - World first / Ultra Polling 1000Hz support Ultra polling rate 1000Hz are the exclusive function of Mechanical keyboard and mouse only. Now, ZM-K600S supports Ultra Polling 1000Hz which can do 1000 times signal in and out per 1 second. Normal keyboards have many keys in a line as a group, so it can be limited in key combination or multi-key input (Ghost problem). While ZM-K600S has an independent line per key and each key is connected to the processor directly, so it can support unlimited multi-key input without any Ghost problem.