disclosed herein is a device that releases a bow string in response to engagement of parts fitted over the teeth of a user . the present invention provides a release signal transmitting device that includes at least one switching means and a signal transmitter , and a release signal receiving device that includes a signal receiver , a controller and an actuator . the release signal transmitting device has a mouthpiece structure that is fitted over the teeth of the user . the release signal receiving device has a shooting mechanism that is interlocked to the actuator .