Klein Tools Cat. No. 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. Klein®, AESEM1S, Ear Muff, Situational Awareness, 88 dBA Noise Reduction, Orange/Black/Gray, ABS/Polycarbonate/POM/TPE, 7.03 in H x 6.18 in W x 3.9 in L Dimensions, Specifications Met: IPX4 IP Rating 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 Noise Reduction Rating (NRR) of 23 protects and prolongs your hearing Dual-knob design with unique grooves enables independent control of SMART SENSE and Bluetooth® volume Vented headband provides cool comfort in the hot summer months Soft memory-foam ear cushions designed for all-day use Noise canceling microphones eliminate background for crystal clear calls in loud environments Durable construction with 6.6-Foot (2 m) drop protection and IPX4 rating Specifications Color : Orange/Black/Gray Dimensions : 7.03 in H x 6.18 in W x 3.9 in L Material : ABS/Polycarbonate/POM/TPE Noise Reduction Rating : 88 dBA Specifications Met : IPX4 IP Rating Type : Situational Awarenes