Send silent text messages to friends. Type into adjustable armband transmitter and hit send. Messages appear digitally before your eye. Transmits up to two hundred feet away and works through walls. Includes two transmitters and two headsets. Put on the headset display and use the arm-mounted keypad to transmit secret messages. The ultimate in high-tech communication, Eye-Link Communicators are the first headset display text-based communications devices. Each package comes with two heads-up digital displays and two keyboard transmitter/receivers.