The bone-induction speaker technology, similar to some hearing aids, conducts the sound to your ear, giving the impression that it is more audible to surrounding people than it actually is. But with many casinos and bars preemptively banning Glass, further design changes may be in the offing. Google must ensure that onlookers feel comfortable in the presence of Glass wearers. Some analysts speculated that product launch postponement from late 2013 to 2014 might be due to addressing these concerns.