Shure SB910, Li-Ion Battery, For the ULX ADX1 pocket transmitter, 3.6 V, 2200 mAh, Dimensions: 13.9 x 39.4 x 53.3 mm, Weight: 48g@+*Notes on disposal:* Due to the current battery law, you are obliged as the end consumer to return all used batteries and cells. Disposal with household waste is not permitted!