Up to 18 Sets Connectable: These Red Led Xmas Tree Lights String Are Safely End-To-End Connectable Up to 18 Sets for Total 594Ft Decor Length On One Plug . Wide Angle, Brighter Christmas Lights Decoration: Designed with A Concave Lens, These Wide Angle Bulbs Are 25% Brighter Than Standard-Shaped Light Strings and Disperse Light Equally In All Directions, Making Your Decoration Shine Brilliantly From Any Viewing Angle. . Ul Certified, Waterproof Red Christmas Lights Outdoor: Ip44 Waterproof Red Xmas Tree Lights, Ul Certified; Approved for Indoor/Outdoor Use. Ideal for Indoor Outdoor Christmas, Tree, Party, Home Decorations. . Energy Saving Led Christmas Lights: Adopting Led Technology, These Mini Red Xmas Tree Lights Are Very Durable Long Lasting, and Extremely Energy Efficient, Reducing Power Consumption By More Than 80% Compared with Conventional Bulbs.