Essential for Emergencies: Stop worrying about dead batteries! With a shelf life of 5 years, these glow sticks are a must-have for any first aid kit, survival kit, camping, hiking, or outdoor adventure. The stick features a engraved tracking number centrally located along its midsection. The code(TDxx25) corresponds to the manufacturing date, with the product maintaining a 5-year validity period commencing from this documented production date. Reliable and Long-lasting Output: Superior to the usual party sticks, these emergency glow sticks will provide reliable light throughout the night, with up to 8 hours of glow duration. Versatile: The glowsticks are water-proof and easy to carry, making them the ideal choice for signaling, marking, or lighting up your surroundings in case of an emergency. Easy to Use: Simply snap and shake the glow sticks to activate them, no batteries or electricity required. Premium Quality: These industrial grade Glow Sticks offer military level quality that ensures a perfect blend of premium materials to provide you with long shelf-life, non-toxic, waterproof and CPSIA Compliant safety glow sticks. Glow Fever Emergency Safety Military 6 Inch Light Sticks are specially formulated to deliver dependable, bright and sustainable lighting in this field. Special foil packaging ensures easy color recognition and extended storage life. New safety hook design, provide positive insurance that you are lighting the fluoresce Light. All Light Sticks are manufactured with the military level quality control and consistent production standards. Chemical based lighting is 100% Waterproof, Non-flammable and Non-Toxic. They produce no heat or sparks and easy to use!