Wiktionary
n. A device that is capable of operating in two frequencies. On a wireless network, dual-band devices are capable of operating in both the 2.4GHz (802.11b/g) and 5GHz (802.11a/n) bands. In cellular phone technology, dual-band devices typically operate in both the GSM900 and GSM1800 frequencies, allowing a greater number of roaming options.
Usage examples of "dual-band".
He had not forgotten that it was his birthday, in fact he had spent the day debating with himself the advisability of ordering, from an outfit in California, a complete, prepackaged, do-it-yourself dual-band satellite dish, antenna, feed horn, down converter, receiver, and positioner, and was still debating this purchase, trying to determine how long he might be interested in all this hardware, should he decide to buy it for himself for his birthday.