This is a set of two different 7 bulb, multi-color Christmas tree string lights that work when connected together, and independently as well. They both come in their original packaging and have the electrical tags attached. There are two in the set:

1 - Paramount Straitline Indoor Lighting Outfit with Kliptons, Each Lamp Burns Independently. There are six solid color bulbs in orange, blue and red and one translucent red bulb. They are on a twisted red and green wire. The original cardboard insert for storage of the lights is still included with the box, as well as the printed instructions. All bulbs lit when plugged in. The translucent one seemed to have a flashing effect. The box has wonderful retro colors and graphics and is display worthy in itself. Edge and corner wear, as to be expected and the front opening piece is torn a bit on the bottom. Likely 1950s. Dimensions: Box - 12" x 5 3/4" 1 1/2", Bulbs - 1 1/2" tall

2 - Charm twinkle lites, 7 Light Multiple Set, Indoor Use Only, They Twinkle Like Stars, Each Lamp Burns Independently. There are seven translucent bulbs in pink, green, blue and red. They are on a twisted red and green wire. The original cardboard insert for storage of the lights is still included with the box, as well as the printed instructions on the back. Only four bulbs lit when plugged in, but they did have a twinkle effect. The box has wonderful retro colors and graphics and a cellophane window that is in tact. Edge and corner wear, as to be expected, and one of the the box has been creased and is not square. Likely 1960s. Dimensions: Box - 11" x 6 1/4" 1 1/2", Bulbs - 1 1/2" tall

They do connect and light when put together. (The second picture shows them both lit)