GLOW IN THE DARK WHISTLE
Simply leave them in sunlight / direct light during the day and watch the eerie green glow in the dark ! You just need to "re-charge" them periodically to keep the glow going for hours.
NOT DESIGNED FOR INDIVIDUAL RESALE DUE TO BULK PACKAGING
Please don't confuse these with cheap plastic whistles, they each contain a 'pea' for that extra shrillness and loudness of a quality whistle !