Milwaukee REDLITHIUM USB Bluetooth Jobsite Ear Buds deliver uncompromised sound with a powerful and balanced audio experience, allowing you to take phone calls seamlessly. Featuring Jobsite Aware Mode, these earbuds provide situational awareness by reducing the intensity of loud external noises, so you can control your awareness on the job. With up to 10 hours of runtime on a single charge and an additional 70 hours provided by the REDLITHIUM™ USB case battery through multiple in-case charges, these earbuds all-day performance. Built to withstand tough jobsite conditions, they are water, dust, and impact resistant. Designed specifically for on-the-job use, they include passive hearing protection with silicone and foam ear tips. The earbuds come with multiple interchangeable ear tips and wings to ensure a secure and comfortable fit. Model Number: 2191-21