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The ISOtunes LINK 2.0 Earmuff got an upgrade. This Bluetooth unit now offers a padded headband cushion up to 50 hours of battery life and an ISOtunes Boom Microphone option for crystal clear calls. Boom microphone sold separately. For the option of up to 100 hours of battery use 3 AAA batteries not included. This earmuff allows you to stay connected to others while on the job with its Bluetooth 5.0 connection that blocks damaging noise from power tools power equipment and heavy machinery. This earmuff makes your work more enjoyable and conserves your hearing. Built for durability with an IPX4 sweat- and water-resistance rating this earmuff offers a comfortable vented headband and a foam insert to keep you cool. Raised buttons allow easy navigation. Vented headband with comfort foam insert and memory foam ear cushions Raised buttons for easy navigation ANSI certified 25 dB NRR OSHA compliant hearing protection SafeMax Technology limits volume output to 85dB Up to 50 hours of rechargeable battery life AAA battery compatible for up to 100 hours of connection AAA batteries not included IPX4 Durability for sweat and water resistance Compatible with ISOtunes Boom Microphone sold separately for clearer calls in loud environments Bluetooth 5.0 connects and dual-connects devices up to 30ft. Siri/Google voice compatible Model Number: IT-48. Age Group: adult.