The 24 ultra-bright smart LED NeoPixels are arranged in a circle with an outer diameter of 104mm. The rings are 'chainable' - you can connect them together by connecting one's output pin to another's input pin! Each LED driver chip is addressable while inside the LED. Each has a ~18mA constant current driver, so the color will be very consistent even if the voltage changes. Technical Features Intelligent reverse polarity protection ; Voltage: DC4-7V ; Model: WS2812 24 Bit RGB ; Communication interface: one-wire communication ; Color: black ; Outer diameter: 85mm ; Inner diameter: 70mm ;