Chad Kresser of Lenovo demonstrates the ThinkPad Stack concept, a device that is modular by design to allow for accessories to be stacked on to it. This display unit features stacked units for functions such as additional power (battery pack), storage capacity (1TB HDD), and sound (Bluetooth speakers). The stackable projector features 150lumen brightness, 720p video resolution, and uses a RealTek ARM CPU, and 16GB of onboard storage. The inbuilt battery lasts 2 hours, going up to 8 with the power bank. Prices for the WiFi access point and HDD (sold as a kit) is US$200, the power bank is US$50, the Bluetooth speaker is US$90.