Sklar's Fiber-optic Laryngoscope Handle is a hook on style handle that is compatible with the Green System of fiber-optic compatibility, indicated by a green band around the handle near where the blade attaches. It can be used with fiber-optic laryngoscope blades that also follow the Green System of compatibility. This product is the medium size handle, and requires 2 "C" batteries, which are not included with the handle.