Lenovo waterproof robust case for the Tab M11 / K11 TB330 with modular XDOCK. The back of the case features a slotted rail system that allows you to attach and swap various modules and accessories to the case. These can include a card readers, extra power pack, hubs and more.Shockproof,Crystal clear builtin screen protector, Waterproof from above with the screen lying face up, 360 degree swivel hand strap design for onehanded operation, Super sturdy and lightweight, Childfriendly design, Raised edges on the front protect the screen when lying face down, XDOCK modular design enables high level customisation and endless functionality.