Features: 1.2.4ghz wireless technology provides reliable connectivity in the 20m range. 2.Round cap button design gives you a more comfortable experience. 3.Press FN+Multimedia button to quickly realize multiple shortcuts such as play/pause, volume adjustment, etc. 4.Use a silent micro switch to achieve a better mute effect. 5.Compatible with mutiple systems, such as for Win2000 / WinNT4.0 / WinXP / Win.NET / Win7/8/10 / OS X10.8. specification: 2.4ghz wireless technology provides reliable connectivity in the 20m range. Round cap button design gives you a more comfortable experience. Press FN+Multimedia button to quickly realize multiple shortcuts such as play/pause, volume adjustment, etc. Use a silent micro switch to achieve a better mute effect. Compatible with mutiple systems, such as for Win2000 / WinNT4.0 / WinXP / Win.NET / Win7/8/10 / OS X10.8. : Number of Buttons: 90 Keys + Multimedia Compatible System: For Win2000 / WinNT4.0 / WinXP / Win.NET / Win7/8/10 / OS X10.8 Rate of Return: None Working Frequency: 2.4G Switch: Membrane Switch Resolution: None Working Current: 1.5mA Battery Model: AAA (Not Included) Color: Black / White and Pink / White and Green / White (Optional) Package List: 1 x Keyboard 1 x Mouse 1 x Instruction Manual 1 x Receiver Note: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.