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Parameter: 1. Model: WS2812 strip 5050rgb chips 2. Working Voltage: DC5V 3. Wattage: max 9W/meter 4. Signal:WS2812B (WS2811 chip built-in LED) 5. Wave length(NM):R,650nm ; G,520nm ; B,460nm 6. LED Quantity: 30leds / m, 4meter / roll, one pixel IC control one 5050 led 8. View angle:120 9. Life span:more than 50000hrs 10. PCB color: Black 11. Protection rate: IP20 Non-waterproof 12. Length:4meters / 13.1ft 13. FPCB Width:10mm 14. Product Dimensions:L4000mmxW10mmxH2.5mm Package included: 1x 4M WS2812B 30 leds/M Black PCB IP20 Non-waterproof DC5V LED Strip 1x 3pin female JST connector Precautions: 1. Search for "Yaqing Lighting" on Amazon to know more about Yaqing Lighting's products and details. 2. Using voltage 5V. higher than 6V will destroy it. 3. If you need better led strip performance, you can use a led controller.Related product links will give you a choice. 4. The LED strip is made of 50cm FPCB, so each 50cm led strip has a solder joint.The solder point will not effect on the strip's performance.Most of the LED strips on the market are manufactured to a half meter length. 5. If you need more data of WS2812B, please contact us and we will send it to you.