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. Features: Earmuffs with SMART SENSE allows users to safely listen to their surrounding environment and clearly communicate with co-workers 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 cancelling microphones eliminate background for crystal clear calls in loud environments Durable construction with 6.6-Foot (2 m) drop protection and IPX4 rating Specifications: Overall Length: 3.9" (9.9 cm) Overall Height: 7.03" (17.9 cm) Overall Width: 6.18" (15.7 cm) Batteries: Lithium-Ion Battery Life: 25 hr Charging Time: Approx. 2 hr Color: Orange, Black, Gray Connectivity: BT 5.1, Wireless Range: 32.8' (10 m) Drop Protection: 6.6' (2 m) Maximum Volume: 88 dBA IP Rating: IPX4 Material: Earcups: ABS + PC; Headband: POM + TPE Indoor/Outdoor: Indoor/Outdoor Included: USB-A to USB-C Charging Cable; Carrying Bag Weight: 15.45 oz (438 g) UPC: 092644693946 Klein Situational Awareness Bluetooth Earmuffs AESEM1S