What's It For: A handy tool to connect 4-pin 10mm (0.39 in) wide 5050 RGB flexible LED strips to get an extension. Even works with waterproof LED strips with a silicone coating over, as long as they're 4-pin. How to Use: Just open the clip with the supplied opener, place the light strip on the pointed pins while keeping the + aligned, snap shut and done Quick and easy setup with solderless snap down connectors. How It Work: Metal pins in the connector puncture the light strip on the copper contact points, making the connection incredibly secure even with minor wiggle and pulling. p> Why Choose Us: JACKYLED LED Connectors are made from PBT fireproof material, heat resistant, fireproof with no fire hazard. Work with light strips consuming 72W max, safe to pair with both high and low wattage light strips. What You Get: 10 pieces of 4 pin LED clip connectors and 1 pcs clip opener. If you have any issues, inquiries or need assistance, please feel free to contact us directly.