Compatible Devices: MX ERGO MXTB2d/MXTB1s Color: Pink Size: S This case is specially designed for the MX ERGO MXTB2d/MXTB1s Bluetooth wireless trackball. External dimensions: 15.6 x 12.6 x 6.6 cm [Shock-resistant outer layer] The outer layer uses EVA material, which is hard and has excellent shock resistance. It also has excellent surface water resistance and dustproof properties. It can firmly protect the wireless trackball MX ERGO MXTB2d/MXTB1s Bluetooth MXTB2 MX ERGO S.