Secure high-quality steel charging carts with a compact footprint that provide safe storage and transport for up to 40 devices. Features include a full range, secure, easy-to-use, universal for mobile devices up to 15.6", a new flexible slot shelving system, modular design, 360° access from the bottom with top loading for easy handling, and doors that convert into shelves for easy distribution. Compact footprint for easy shipping, takes up minimal floor space, easy cable management, custom color configurations with branding options, vented panels, additional shelving for power strips and chargers, and certified EU power supply with CE and RoHs compliance.