M20 Electronic Earplug is a more convenient and excellent hearing protection product. It adopts in-ear electronic hearing protection, which can help reduce continuous noise and impulse noise, while suppressing dangerous noises higher than 82 dB, and improve perception and communication in the noisy environments. There are two modes of indoor and outdoor to adjust the ambient sound. It is suitable for use in high-noise environments such as shooting training, law enforcement, manufacturing and construction, making work comfortable and efficient. The battery life can be up to 8 hours and there is a low-battery reminder. The portable charging case does not need to replace the battery, which is convenient for charging. Compared with traditional noise-canceling headphones, which are smaller and lighter in weight, the electronic earplugs combines compatibility, portability and comfort. It comes with a silicone Retention cord to prevent loss, and accessories such as earpieces cover and eartips of different sizes are convenient for users with different ear sizes. - Noise reduction rating +NRR22 - Intuitive one-button operation - Rechargeable, high battery life - 2 sound effects (indoor and outdoor) - Power, low battery prompt - Automatic shutoff after charging, automatic shutdown after 2 hours standby - Portable, comfortable and compatible - Anti-lost silicone Retention cord - 3 sizes of earpieces cover and eartips - The included data cable can be used for charging - IPX-4 water resistance