Shure SLXD3 S50, Digital Clip-On Transmitter, Frequency range S50: 823 - 832 MHz, XLR connection with 12/48V phantom power, Operation with AA battery or rechargeable battery possible, Operating time: approx. 8 hours, Optional: Shure SB903 - Lithium-ion rechargeable battery #499632# (not included), Including AA batteries and leather protective cover with integrated belt clip