The invention provides a circuit device, embedded in an object, which includes N light-emitting devices, a motion-actuated switch, a controller, a battery, and a water-proof enclosure, N is an integer larger than 2. In addition, each light-emitting device includes a respective first light-emitting diode and a second light-emitting diode. The motion-actuated switch is capable of sensing a motion of the object, for generating a controlling signal. The controller is electrically connected to the motion-actuated switch and each of the light-emitting devices for driving the first light-emitting diodes and the second diodes lighting on the basis of at least one lighting sequence when triggered by the controlling signal from the motion-actuated switch.