SHURE SB900B

Li-Ion Battery (3.7 V/1240 mAh), fits all ULX-D, QLX-D, Axient Digital AD Transmitters and PSM P3RA, P9RA+ and P10R+ Receivers, battery life: up to 8:55 hr (1 mW, 10 mW) or up to 6:35 hr (20 mW)