Twinkly Smart Decorations Custom LED String Lights With 400 lights in the box, the Twinkly Smart Decorations Custom LED String Lights ($200) allow you to customise your display with designs and effects via an app. One cool feature is you can use the app to scan and detect the exact position of every single LED light through your smartphone camera. You can change the colours and speed, and even sync the lights to music. Image Source: amazon.com Twinkly Smart Decorations Custom LED String Lights $200 from amazon.com Buy Now