Excellent Noise Cancellation Noise Cancellation Level NRR40, designed with reusable high-fidelity earbuds, reduces damaging decibel levels, protecting your ears in noisy areas without compromising sound quality. The earbuds come with soft nano silicone and 10 replacement memory foam ear tips. Nano silicone earplugs and sponge earplugs can be switched freely. Reusable and Washable Our noise-cancelling earbuds are made of high-quality silicone material, which can be cleaned with confidence after getting dirty, will not be damaged, and can be reused for many years. Super comfortable Still worrying about the uncomfortable earphones? The ultra-soft silicone material ensures that Our noise-cancelling earbuds are very comfortable to wear, and the ergonomically designed structure allows the earbuds to fit snugly against your ears, making them less likely to fall out even when sleeping on your side. Convenient and Portable Our noise-cancelling earbuds are so simple and compact that you can always take them with you. An earbud case is included to provide a safe place to store earbuds when not in use. These noise-cancelling earbuds can help you sleep better at night and be able to settle down to focus on work and study. Friendly Tip Please grasp the ear tip first, then pull the ear tip down very slowly and gently to break the seal of the ear canal before pulling the ear tip out. Do not pull out the earbuds directly. Instead of reducing all sound to 0 decibels, sleep earbuds only block unwanted noise and protect your comfortable sound.