For Disney World you MUST have 14 channels and at least the same number subchannels And the MOST IMPORTANT a Quelch!! For every walkie talkie there are 4 kids playing on them!! But that wasn't the WORSEST it was wierdo's trying to get my DD to met them and talking Dirty over them!! WE had a pair that had a Quelch,but the distance was too short,so we took them back. The Cobra's we got to replace them altho free,weren't good enough for WDW,so we had multiple problems!!