Feature●Base station for SDW 5064 and SDW 5063 (without BTD 800 dongle).●Model Number: SDW 5BS-US●Item Package Dimension: 3.43" L x 4.13" W x 4.8" H●Item Package Weight: 0.71 lbDescription Sennheiser SDW 3 BS (507048) is the base station for SDW 5064 and SDW 5063 (without BTD 800 dongle).