Walker's Restrictor BT Earbuds combine an impressive 24 dB NRR (Noise Reduction Rating) to shield your hearing from gunshots and other loud noises, while integrating BluetoothA(R) 5.0 for seamless connectivity to mobile devices through the Walker's Link app. With the app, users can independently control each earbud, switching between four advanced sound modes-Universal, High Frequency, Power Boost, and Clear Voice-for a unique experience. SAC (Sound Activated Compression) technology delivers rapid, reliable hearing protection, immediately activating in the presence of loud noises to ensure wearers' safety. The earbuds feature the patented Sure-Lock fin and foam tip system and ergonomically placed buttons that are both easy to access and sleek in appearance. Noise Reduction Rating: 24dB Bluetooth 5.0 connectivity Control via Walker's Link app Four modes: Universal, High Frequency, Power Boost, Clear Voice Sound Activated Compression hearing protection Dynamic speakers for enhanced audio Rechargeable lithium-ion batteries, up to 14-hour runtime Includes locking fins, foam tips, and micro-USB cable