To activate, twist backing clockwise until tight. To deactivate, twist backing counterclockwise. ITEMS DO NOT COME IN PAIRS. EACH ITEM IS INDIVIDUALLY PACKED. Dimensions: Height: 0.62 in. , 1.57 cm. Width: 0.62 in. , 1.57 cm. LED Colors: Red Red Red Blinky No Clasp includes 2 replaceable CR927 Batteries. Packaging: Individually wrapped, poly bag – 25 pieces per.