The Hornet Sting
Details showing the flip open cap with light, the foldable handle, the end tip. It appears to have 5 telescoping segments coming out from the basic unit. The size closed is approx. 14.5", extended approx. 42" The tv series shows this telescoping action to be automatic (maybe co2 activated) or later just a wrist flick to extend!
early Sting version, notice large handle and 5 telescoping segments. 
Later Sting, thinner with tip, again 5 telescoping segments.
click for the Hornet Sting sound in .mp3 format
Click for other pictures with instruction and maintenance sheet!
There was an accurate replica (pictured above) made in very limited numbers (maybe 10?) in the early 90's. Very hard to find and expensive that includes a sound chip. For a prop device try finding a long tactical baton or a camera/telescope tripod/monopod leg that can be modified. I've even seen some cheap Star Wars plastic LightSabers that could work.
The Green Hornet/Britt Reid's watch can be used as a voice communicator with the Black Beauty or to activate the "buzz" signal in District Attorney Scanlon's glasses
The phone scrambler/security device
The Green Hornet's Flashlight
The Green Hornet's Secret Compartment Ring
Seen in episode "The Silent Gun", concealed in the GH's topcoat pocket and used as a homing transmitter picked up by the Black Beauty.
Kato's throwing darts
The Gas Masks
Kato checks his gas mask in "Beautiful Dreamer"
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