AESEM1S Smart Sense Electronic Hearing Protection Safety Earmuff with Bluetooth & Situational Awareness, NRR 23Db, 25Hr Runtime. Hearing Protection Bluetooth Earmuffs. 3.9 x 6.18 x 7.03 inches. 1 Lithium Ion batteries required. Situational Awareness, Bluetooth, 23NRR, Dual-Volume Knobs, Hands-Free Calling, Vented Headband, Environmental Noise Cancelling Microphones. Situational Awareness + Bluetooth. USB-A to USB-C Charging Cable; Carrying Bag. SMART SENSE: Advanced situational awareness technology empowers users to hear their surroundings by intuitively amplifying faint sounds to improve communication clarity while reducing high impulse or continuous noises down to a safe listening level. PREMIUM AUDIO QUALITY: Immerse yourself in superior sound with deep bass, clear mids, and crisp treble, thanks to cutting-edge Bluetooth 5.1 technology. PRECISE AUDIO CONTROL: Independently adjust Smart Sense and Bluetooth volumes with the dual-knob design. EXTENDED BATTERY LIFE: Enjoy uninterrupted listening for up to 25 hours on a single charge, thanks to the fast-charging USB-C rechargeable battery. ALL-DAY COMFORT: Designed for extended wear, these earmuffs feature a vented headband for cool comfort during hot summer days, and soft memory-foam ear cushions for a snug fit every time. AESEM1S Earmuffs are engineered to incorporate both Situational Awareness and Bluetooth technologies for connectivity to surroundings and music. The dual-knob design featuring unique grooves for easy identification enables users to precisely adjust their Situational Awareness or Bluetooth volumes. Ergonomically designed vented headband provides cool comfort for all-day wear. These earmuffs charge in 2 hours, providing 25 hours of runtime. For more than 160 years, Klein Tools has manufactured premium-quality, professional-grade hand tools that deliver the performance, durability and precision needed to get the job done right. Our family of engineers, workers and craftsman continue to put six generations of expertise into every tool we create by using only the highest quality materials, superior workmanship, and keeping manufacturing as close to home as we can. Klein isn’t just the name of our company, it’s also our family name. And since we’re an American company that’s family-owned and family-run, you know you can count on us to be here tomorrow. Klein Tools doesn’t just make great products, we make great products that stand up to the demands of the professionals who use them every day… We offer the best prices around on high quality products. Our E-store includes media such as books, movies, music and games while offering electronics, toys, sporting apparel, clothing, tools, general home, garden items and more. We are always working hard to ensure your package arrives as soon as possible. We do not accept P. Please provide a physical address. We try our very best to make sure every customer is completely satisfied. If there’s a problem, message us! We’re happy to help.