I had written about what are the silent mouse options in the market in one of previous posts. Thanko is one of the most known manufacturers of silent mouse and keyboards. Their silent mouse model was 5 times less sound producing. This time they have developed a better silent keyword version. Actually, many new laptop and netbook models already have much silenced buttons but Thanko Keyword EX emits only 44.5 DB noise beating all of them.
Since DB is a logarithmic measure (Calculated using power of tens), small changes can effect the noise level highly. For example while a normal conversation provides around 60 dB, whisper does 20 dB. A mosquito buzz is 40 dB. Decide yourself. I have found a useful page which explains decibel and properties of sound waves with samples if you are further interested.
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