3pcs 60mm Model 3-Light metal traffic signal lights include red, green and amber bulbs. (Prewired quality products) Black wire is for positive, the other three are for negative (each line corresponds to the color of the glowing colors, such as green line glows green) You can also connect with 5V transformer without circuit board, black wire with positive, and the other three with negative. Great accessories for diorama, buildings, train models.   This item is NOT sold in stores! Guaranteed Safe Checkout: PAYPAL | VISA | MASTERCARD | AMEX | Discover Click ADD TO CART To Order Yours NOW! 100% Satisfaction Guaranteed With Every Order. *Due to high demand please allow up to 3-4 weeks for delivery. This Item ships from our international supplier.