This is a throwback in time for sure, is brand new (and tested)! This little ball like thing allows you to plug in a strig of lights, and with every sound comes the flash of the lights, hence SOUND FLASH. Simply plug SoundFlash into any 120 volt outlet, then plug your Christmas lights into the SoundFlash (one outlet). Your Christmas will glow brighter than ever before. Your lights will sparkle and twinkle at the sound of noise, voices, etc. So sensitive to the slights sound causes them to flash. Dial designates the sensitivity I believe. Pretty cool for someone who wants a flashy tree setup! It doesn't have to be used for Christmas, could be used all year around where sting lights are used. I take pride in my pictures and are a valuable extension of my description. Please take time to see the product fully. Buy with confidence! All items are packaged with great care and shipped next day, excluding any weekends and holidays. I will combine shipping whenever possible as long as the products can be safely packed together. Please remember to leave feedback, it helps to keep good sellers . International Buyers: We do not mark merchandise as a gift or below value due to it being against US and International Regulations. All custom fees and duties are the responsibility of the buyer. Seller is not responsible for any package held by Customs. If returns are accepted. Must be returned in the same condition as received and in same or similar packaging.