Activ Hub is a specially designed USB (Universal Serial Bus) device that enables wireless connectivity for the Activ Board range through Promethean's Activ Air RF technology. Like Bluetooth, Activ Air "channel hops" to avoid interference, & operates in the same highly regulated & globally approved 2.4 Ghz frequency (with a range of 100 meters in free space). Because Activ Air is Promethean's own technology, risk of interference from other devices is significantly less than with Bluetooth or other similar devices. Activ Air also enables simultaneous use of multiple Learner Response devices & handheld telepointing peripherals such as Activ Slates through a single computer connection.