Primary/Compact Accessories
The Lenovo ThinkPad Stack is a collection of compact accessory devices that address the specific needs of business users, be it connectivity, phone conferencing, or shared storage.
Connector Pins
As the name suggests, these accessories are made for stacking, with magnetic feet that secure the units together and pass-through connections (with Pogo Pin connectors on top and bottom) that let you stack them in any order.
Full Stack
The four Stack accessories being offered at launch are named for their functions: Power Bank, Bluetooth Speaker, Access Point, and External HDD. (Listed from the bottom up.)
Connectivity
Stack Access Point provides network connectivity for several devices and itself can connect via Ethernet, Wi-Fi (both 2.4 and 5GHz), and even supports LTE/3G dongles.
Mix and Match
The entire ThinkPad Stack system, with all four modules, will begin selling this April for $299. The modules will also be available to mix and match, with the Bluetooth Speaker selling separately for $89.99, the Power Bank for $49.99, and the Wireless Access Point sold in a pair with the External HDD for $199.99.