The Sony BATC-2AA Battery Case provides quick and easy AA battery exchange for Sony URX-P2, UWP-V1,UWP-V2, UWP-V6, UWP-X7, UTX-B2, UTX-B2V, UTX-B2X ,URX-P2, DWT-B01, DTW-P01,WRT-8B, WRT-822A ,WRT-822B Bodypack Transmitters.