Elecom USB-A Receiver Wireless Keyboard, Silent Design, Tenkeyless, Antibacterial, Black TK-FDM115SKTBK Authentic silent design. Usable with Windows, Chrome OS, and macOS. Furthermore, a wireless, silent, tenkeyless keyboard with antibacterial specifications to add peace of mind to your daily computer operations. The silicone rubber attached to each keytop reduces keystroke noise by over 90% compared to conventional products. Suitable for use in public facilities, conference rooms, late at night, or early in the morning, where noise is a concern. *1 *1 This is the result of comparing the magnitude of sound energy calculated from the sound pressure levels of this product (approx. 15dB) and the conventional model TK-FCM062BK (approx. 45dB). Sound energy is a value calculated from the measured sound pressure level (bel value) and the reference value (the smallest sound that humans can hear). By incorporating proprietary firmware, it can be used with Windows, Chrome OS, and macOS. Even if liquids such as water are accidentally spilled on the keyboard, a drainage mechanism is installed that allows liquids to be immediately drained from the water drain holes on the back of the main unit. (Not waterproof design)