Light control "220V AC Cooling Fan" DIY-free solder circuit for beginner students and electronic assembly. Ordinary resistor, photoresistor, triode several common components, consisting of simple and practical light control circuit. Photosensitive resistance sensor, light intensity, the light-sensitive resistor becomes smaller, the transistor is turned on, the fan is running. Weak light, the photosensitive resistor increases, transistor cut-off, "220V AC Cooling Fan" to stop working. Hot summer, cool 'down', which is a fan wear new clothes to show their own stage time. This mini "220V AC Cooling Fan" in small white lens Canon inspired design, modeling is not only realistic, but also very creative and unique. As long as the battery installed, remove the lens cap, turn the switch image stabilization, you can enjoy it brings cool breeze blowing. It also admiration, pictures, and more are photographers novelty collection baby!