A wearable communication device includes a bone conduction actuator which is applicable for being in contact with a user's wrist, hand, back of the hand, finger or nail in order to transmit voice signals. The user inserts the user's finger into the user's ear canal, or touches the user's finger to a...http://www.google.co.uk/patents/US6912287?utm_source=gb-gplus-sharePatent US6912287 - Wearable communication device
