20-Device AC Charging Tower for Chromebooks - Open Frame, White. Provides high-speed AC charging and secure storage for 20 Chromebooks or tablets in a space-saving form factor designed for crowded rooms. This wall-anchored, floor-standing 120V charging station provides high-speed AC charging, secure storage and cord management for as many as 20 Chromebooks, tablets and other mobile devices with a screen size up to 16 inches. The CST20AC is recommended for schools, small/medium businesses, medical facilities, government agencies and anywhere else that uses Chromebooks or tablets on a daily basis.