Color Availability: Two versions are available, solid white light (LED) or 7 color changing (LED) 
Stand Size: ~4" Across
Center Hole Width: ~1.2" across so will fit any sphere that can sit in that or any other object that can cover that across. 
Power Cord Length: ~38"
Power Switch: On/Off button located ~17" down the cord
Power Connectivity: USB Powered, either plug it into a device such as your laptop or a usb port on a compatible power strip, usb hub, etc.

This listing does NOT include any of the pictured spheres or other crystal items.  Only the Sphere Stand itself is included.  For reference the spheres pictured here are ~65mm(2.5").