In Stock. TRUE DIVERSITY and 35 HOURS OF BATTERY LIFE! AKG's WMS40/DIV/880 is the true diversity version of the best selling WMS40 series, and now has an extended battery life of up to 35 hours on 2 AA's! Equipped with a SAW filter for excellent interference immunity, the handheld mic features the same high quality, Neodymium capsule as the standard D-880 microphone.