Klein Tools AESEM1S Situational Awareness Bluetooth® Earmuffs. 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. SMART SENSE featuring situational awareness technology allows users to safely listen to their surrounding environment and instantly identify potential hazards. Intuitive amplification of low-level sounds enhances clear communication between co-workers. High impulse, impact or constant sounds are compressed down to a safely listening level of 85dB. Enjoy premium audio quality with rich bass, clear mids and crisp treble through the latest Bluetooth® 5.1 technology. USB-C rechargeable battery offers up to 25 hours of runtime on a single charge. Since 1857, the company operated by Mathias Klein and his descendants to the fifth generation, has grown and developed along with the telecommunications and electrical industries where Klein pliers first found major usages. Today, Klein Tools, Inc. Represents much more than Klein pliers. The company’s product line has broadened to include virtually every major type of hand tool used in construction, electronics, mining, and general industry in addition to the electrical and telecommunications fields. Klein Tools also supplies a line of occupational protective equipment, which is exhibited in a separate catalog. Internationally, Klein’s products are available around the world through a well-established network of agents and distributors who stock the products that are required for their particular markets. Klein’s reputation as a leading producer of professional-quality products is global. Like the industrial fields it serves, Klein Tools has grown dramatically since 1857. Warrants that the products set forth below will be free from defects in material and workmanship, under normal use for the timeframes listed below (unless otherwise noted on the product packaging). In no event shall Klein Tools be liable for incidental or consequential damages. Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to you. The normal life of the product. Tool Pouches, Tool Bags, Tool Belts, Suspenders, Coolers, Soft Storage, Knee Pads. Fish Tapes, Fish Rods, Tape Measures, Levels, Folding Rules. Electrical Test and Measurement Tools. Products Containing Rechargeable Batteries. (including but not limited to Flashlights, Illumination Products, Audible Entertainment, and Borescopes). Products warranted to be free from defects in materials and workmanship when delivered to the customer. (including but not limited to Triple-Taps, Drill Bits, Step Drills, Carbide Hole Cutters, Hole saws and Arbors, Saw Blades and Jab Saws, disposable Razor and Knife Blades, Stripper Cartridges, Gloves, Shoe Covers, Replaceable Cutting Inserts, Wire Marker Books, Bits and Blades, Voice/Data/Video Connectors, Klein Chemicals, Hand Cleaners, and Wire Pulling Lubricants).