Two led sockets. Use any led with leads,legs,. Just insert your led. If the leads are too long clip the excess so it doesn't protrude. Use the color coded wiring, red, positive (longer leg of led) connect to correct voltage. Most white LEDs and blue are 3 volts. Lower voltage LEDs require a current limiting resistor. 1000 ohms . We will provide 2 free resistors . Just message us during the payment process or contact seller .