The HUB™ Mini Base supports up to 8 UltraLITE units, or expands wired intercoms with an optional Interface cable. It offers full duplex communication for up to 8 users with a 1/4 mile range. The system is field programmable, allowing for quick addition of wireless headsets. It features two communication channels and DECT technology. The HUB™ can be powered by a rechargeable lithium battery or AC wall plug, with no FCC licensing required. Each unit includes a rechargeable lithium battery and a multi-port charger that charges both the HUB™ and UltraLITE™ headset batteries. LEDs indicate when batteries are fully charged.