In-ear hearing protection device. Bluetooth V5.0 technology. Bluetooth range up to 10 meters. Built-in rechargeable 3.7 volt lithium-ion battery. Charging time approximately 2-3 hours. Automatically turns off if not connected to a Bluetooth device within 20 minutes. Noise-canceling microphone. Clear calls in noisy environments. SafeMax technology provides exceptional audio quality. Dual connectivity, headset can pair with two Bluetooth devices State-of-the-art design & advanced protection. ISOtunes Sport combines industry-leading hearing protection with breakthrough technology. Advance is the first of its kind; A tactical in-ear hearing protection that is especially appealing to hunters and sport shooters, thanks to active shot noise attenuation. The comfortable fit and Bluetooth connectivity also provide additional highlights. The result? Safety, best-in-class technology and performance all in one. The Tactical Sound ControlTM improves your hearing by 8 times, protecting you from loud noises in less than 2 milliseconds. SafeMax TechnologyTM limits volume to 85 dB for all-day, damage-free hearing. 26 NRR Tested and approved to ANSI s3. 19-1974. lightweight design at only 23.25 grams is also impressive. Bluetooth 5.0 allows you to connect your devices and enjoy the best sound quality. Calls, with loud background noise are thus no longer a problem. The noise-isolating microphone also ensures clear communication in noisy environments. The battery has a runtime of up to 10 hours and can be recharged quickly and easily. Thanks to the IP67 durability, the hearing protector has a sweat-, water- and dust-proof protection.