Baton APS - Expandable.
Expandable batons are composed of a hollow outer shaft and two or three inner telescoping shafts. The tip of the smallest shaft is solid which increases the user’s striking power. The most recognizable name in expandable batons is ASP, which is actually the acronym for Armament Systems and Procedures, Inc., a company that manufactures and sells police equipment. The ASP baton became so popular among law-enforcement officers they began to refer to all batons as ASPs.
To extend the weapon to its full length, the officer simply draws the baton from its holster while making a striking motion. The baton will be in its ready position at the end of the movement.