ABS plastic, Alumminum end panels;Expandable telescopic flashlight and carabiner (carabiner measures approx.; Carabiner measures approx. 1.65"l; Press button at base to turn LED light on/off button; Uses 4 button cell batteries (type LR44), included and replaceable; Note: Item ships with battery blocker; must be removed prior to use; Product Size: 2.56" l x 0.625" dia.;