BlueFire Kids Ear Protection Safety Earmuffs, 27dB Hearing Protection Ear Muffs, Foldable Noise Reduction Earmuffs Kids Protective Earmuffs Ear Defenders for Sleeping, Studying, ShootingBlueFire Comfortable Kids Hearing Protection EarmuffsUses: SNR(Signal to noise Ratio): 27dB NRR(Noise Reduction Rating): 21dB Reduce noise and protect children's hearing Flexibly adjusted to suit various head sizes 360Rotatable & Foldable Ear CupsInstructions for use: 1. Pull the ear cups outward and place them on the ears, so that the ear pads completely cover the ears and are tightly attached to the head; 2. Adjust the height of the ear cups on both