Klein Tools AESEM1 Earmuffs incorporate both hearing protection and Bluetooth technology into a single solution keeping you safe from the elements and connected to your music. Remarkable 70-hour runtime coupled with an ergonomically engineered vented headband and memory-foam ear cushions provide comfort all-day long. Simplistic 3-button design which features oversized buttons allow for easy identification even when wearing gloves. Low-profile design provides passive noise isolation up to 20dB NRR Experience captivating stereo sound with rich bass, balanced mids and clear treble from 40 mm drivers Rechargeable 800 mAh battery lasts more than 70 hours on a single charge for all day and week use Vented headband design helps dissipate heat effectively providing cool comfort in warm environments, while also accommodating baseball caps for comfortable fit Environmental noise cancelling microphones filter out background noise for enhanced call quality and experience in loud settings Intuitive and simplistic 3-button design for easy navigation and identification even with gloves