With a built-in fm-radio receiver, bluetooth and a level dependent function, peltor ws alert xp enables users to have wireless telephone conversations or listen to their favourite music even in noisy environments. Attenuation rating (hml) h=32 m=26 l=19, attenuation rating (snr) 29 decibel, battery life 32 hours, communication type wireless bluetooth, level dependent, fm radio, connection type 3.5mm aux input jack, features built in fm radio receiver, hearing protection style helmet mounted, net weight 465 g, standards/approvals ce approved.