Howard Leight, Impact Sport, In-Ear w/ Bluetooth, Ear Plug, Bluetooth Ver 5.0, Realistic Hear-Through Audio, 85dB Sound Compression, USBVC Rechargeable Battery, Run -Time of 10 Working Hours, Black R-02701. Even more impressive – the extra speed does not result in excessive battery drain. The Bluetooth technology also features separate volume controls for independent or simultaneous use with the hear-through volume controls. Once turned on, the earbuds actively listen and stop sound amplification when encountering loud impulse noises that exceed 85dB, such as gunfire. Environmental awareness is ensured as the shooting earbuds feature 6X sound amplification of low-level frequencies with eight different volume settings for more natural, realistic hear-through in the field. Dual omni-directional microphones further enhance safety, letting you know the direction of each sound. Soft, foam ear tips ensure longwearing comfort, and the flexible ear hook provides a secure fit. The 200mAh lithium battery offers ten hours of continuous run-time. 200mAh Lithium battery offers 50 hours of continuous run-time. 2 Hour charge time.