OTTO's NoizeBarrier Micro rechargeable electronic earplugs offer unsurpassed situational awareness and clear communication, while providing hearing protection from loud noises. The dual-mode NoizeBarrier earplugs offer active hearing protection as well as hearing enhancement for extremely effective sound localization and detection.FeaturesUp to 40 dB of impulse noise protectionUp to 15 dB adaptive noise attenuationHearing enhancement mode - amplifies soft sounds up to 5XNatural hearing for safe soundsAccu-Technology high-definition sound qualityOne-button touch pad, 2-mode operationRechargeable with up to 16 hours of continuous useNRR: 28 dB(Foam Tips); 23 dB (3-Flange Tips)Frequency Response: 40Hz - 16kHzTransducers: Balanced armature receivers (speakers), Wide bandwidth, low-noise MEMS microphones