Meet the PowerSign ADX-4: a table advertising display with WiFi that lets you display your menu and services to your customers. It has a 7″ 1080p HD display and an ARM Cortex-A7 processor. It has a 20,800mAh battery to charge up to 8 phones at the same time.
You can manage multiple advertising displays at the same time. It runs Android and has 16GB of storage space.