Four high intensity LEDs light up and respond to every sound at the same time. For various fun and practical applications such as sound indicator, simple sound-to-light device for music. The unit can also be used to indicate when the doorbell or telephone rings, was sometimes of interest to the hearing impaired. Adjustable sensitivity with potentiometer. Built-in microphone.\n\n--\nOur eBay Store\n\nPlease note: This item has a longer lead time for dispatch then normal as it's a non-stocked item that is ordered in, please see the estimated delivery date by eBay. We will of course ship the item sooner if possible.\n\nWhadda WSL104 LED kit sound-to-light unit\n\nProduct Details\n\nFour high intensity LEDs light up and respond to every sound at the same time. For various fun and practical applications such as sound indicator, simple sound-to-light device for music. The unit can also be used to indicate when the doorbell or telephone rings, was sometimes of interest to the hearing impair;