3m worktunes connect am/fm hearing protector bluetooth technology

powered by 2 aa battteries (not included) or optional li-ion rechargeable battery (alpha 1100 sold separately) all the controls are on the headset so there s no need to be tethered by a cord. if the nrr is used, 3m recommends that it be reduced by 50% or in accordance with applicable regulations integrated microphone lets you make and take phone calls without removing the ear protection excellent am/fm radio performance with clear sound and bass boost option for great listening audio assist technology provides operational and set-up guidance­ without having to take off the headset.syi