the Wwii Clicker, Also Known as a Cricket, Was a Small Metal Device Used by Paratroopers During the D-day Invasion for Covert Communication. by Pressing It, a Clicking Sound Was Made-one Click for a Challenge & Two Clicks for a Reply. Compact, Reliable, & Vital for Identifying Allies in the Dark, It Became a Symbol of Ingenuity & Survival. Clickers Like This Played an Important Part in the Liberation of France in June, 1944. Issued to the 101st Airborne Division, They Enabled Allied Troops to Communicate Without Arousing the Germans. Colours Available in Brass