Black Yellow Red Orange Light Blue Pink Yellow Green Please choose from the above colors. If there is no comment, we will ship randomly. Size: Width 2.5 cm Length: 32-38 cm Neck size: from about 9 cm Light modes: Fast flashing Slow flashing Constant light Please refer to the 5th photo for the LED. CR2032 button batteries are included. Replaceable. Multiple items will receive a discount. ^ ^