Sennheiser L2015 2-Bay Charging StationFrom Sennheiser, the L2015G2 Charging Station is a dual bay charging station for the Evolution wireless microphone series rechargeable batteries. The charger provides fast and easy drop in style charging of up to two BA 2015 Evolution series batteries, and features temperature and voltage monitoring to prolong battery life and avoid damage. Insert batteries directly into the bays, or leave them installed in the transmitters while charging.