Its 21.5 inches long when fully extended, and only 13 inches when collapsed. Comes with a FREE holster (a $15.00 value) for easy carrying. The full length of the metal part is electrified. If the attacker tries to grab the Telescopic Stun Baton from you, he will be shocked. 

A push of the trigger immediately expands the Telescopic Stun Baton and starts shocking. Just push it on the end to collapse. Very easy to do. 

You shouldn't worry about being shocked should the attacker be touching you. Won't happen! The current will not pass to you. Will shock through a 1/2 inch of clothing.