Lotsa Lites Christmas Holiday Flashing Light Bulbs Necklace (Pack of 5) Multi color LEDs, 8 flashing lights and 3 modes, 34" necklace. Batteries are included, Use 2 x AG3 lithium button cell batteries. Blinking light bulbs last approximately 5-6 hours of continuous use. 5 Packs included in the package. Spread Christmas cheer at your family celebrations, holiday birthdays, secret Santas soires, office and ugly sweater parties wearing this fun & festive/cute & colorful accessory.