1. Compatible system: Win2000, WinNT4.0, WinXP, Win.NET, Win7/8/10, Mac OS X10.8 2. Retro dot buttons, silent design, bring a quiet experience 3. Three devices can be connected at the same time, one-key switching 4. Integrated card slot bracket design, can be used for phablets 5. With multi-function knob button, you can easily adjust the volume 6. Cooperate with the Fn key to use the multimedia combination function 7. Battery: 2*no.7 batteries (not included) 8. Transmission distance: about 10 meters 9. Dimensions: 358.88x187x31.89mm 10. Weight: about 650g
