Keyboard Dimension:285X121X21MM  Weight 264G
US layout:78keys
work with Windows 
Silent office keyboard bluetooth version:
totally 2 bluetooth channel and 1 wireless, can link 3 equipment.
weight: 264 g(not including battery)
work with Battery: AAA*2PCS
Keyboard function (standard 88 key + 2 system switch + 3 channels switch)
Compatible to Win XP, Win Vista ,Win7,Win8,Win8.1,Win 10, BT Android 4.3 or later,Mac OS 10.10 or later
Code: long press “FN+1” or “FN+2” or “FN+3”  channel choose button for 2-3sec, the corresponding LED will quick flash and keyboard enter code mode. Each channel supports BT 3.0 & 5.0.
System switching: press the "PC" or "Mac" key in the working mode, and when the corresponding LED lights up for 5 seconds, it indicates that the keyboard successfully switches to the corresponding system. PC is Windows system, MAC is Apple Mac system, and holds the unique function key of MAC system.