Phone Module 6 or 12 Slot: Store, charge, and move your devices anywhere, anytime with Spectrum's New Phone Modules. The Phone Module can accommodate up to six cell phones in the Phone Module 6 Slot or up to 12 cell phones in its Phone Module 12 Slot. The Phone Module 6 Slot is available with or without 6-port USB power and the Phone Module 12 Device is available with or without two(2) 6-port USB power. One shelf can accommodate up to four Phone Modules. One portable Large Caddy can accommodate up to three Phone Modules. In addition, one portable Small Caddy can accommodate up to two Phone Modules.