I love this Vivosun onboard fan speed switch. I was able to plug it directly into an extension cord and then into my built-in 8" exhaust fan straight into the unit. To my surprise, this switch built in more than three fan speed controls, it can adjust the fan speed to your ideal range ;). My order arrived quickly and without damage. Vivosun's customer service is top notch, they will email you within 24 hours if there is any problem. I trust that Vivosun will solve the problem quickly and professionally. I really hope this review helps you make this difficult decision. Good luck thanks for reading
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