Features: Sound activated LED party bracelets (8 pack) automatically sync with music/cheer to create sparkling light shows, solving dull party accessories with quick bright atmospheres enhancement through responsive glow technology. Crafted from sturdy yet portable plastic with ergonomic curves, these reusable glow wristbands feature energy efficient LED lights for extended 12hour runtimes and comfortable all night wear without skin irritation. Perfect for kids, teens, and party enthusiasts seeking safe, skin friendly accessories that withstand energetic dancing while meeting child safety standards for piercing edges and materials toxicity. Elevates birthday parties, music festivals, and themed event like neons raves or retro night with synchronized light effects that reacts dynamically to crowd excitement. Sustainable option with replaceable button batteries and recyclable plastic components, ideal for user friendly event planners needing versatile glow accessories for weddings, marathons, and holiday celebrations. Specifications: Materials: Plastic Size:Approx.7.5cm/2.95inches Package Includes: 8Pcs/Pack Voice-Controlled Glowing Bracelets note: Please allow 1-2cm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color from the item.