WBS670/680 on September 29, 2015 | Marketing Team WBS Systems operate in select frequency bands between 518-686MHz. Whether WBS is used as a standalone wireless communication system or combined with wired intercoms, its frequency agility, rich feature set, audio clarity and performance reliability make every WBS system an excellent choice for live productions. WBS comes in a single or dual channel option, with each base station supporting up to 4 full-duplex wireless beltpacks. The base station is ready with two separate channels for 2-wire or 4-wire connectivity.NOTE: Most users do not need a license to operate this wireless microphone system. Nevertheless, operating this microphone system without a license is subject to certain restrictions: the system may not cause harmful interference; it must operate at a low power level (not in excess of 50 milliwatts); and it has no protection from interference received from an other device. Purchasers should also be aware that the FCC is currently evaluating use of wireless microphone systems, and these rules are subject to change.