An electronic device includes a power source unit and an electronic unit. The electronic unit includes a first switch, a light-emitting unit, and a plurality of pulse switches. The first switch is coupled to the power source unit, and the first switch has a gate electrode. The light-emitting unit is coupled to the first switch. The plurality of pulse switches are coupled to the gate electrode of the first switch. Therefore, the brightness of the light-emitting unit may be effectively controlled to improve the quality of the electronic device.