The Extension cable is just for The RGB Under Cabinet Light, not for The RGBW Under Cabinet Light.

Bason RGB LED Under Cabinet Lighting Closet Puck Lights Color Changing Kitchen Shelf Decoration, 20 Colors, Dimmable Remote Control, 7.5 Watts, 4-Pack, UL Listed, 4P58862H

WORATON Under Cabinet Lighting LED Puck Lights Kitchen Cabient Lights,Shelf Lighting,Under Counter Lighting,Color Changing Dimmable Remote,16 Colors,4 Modes,4-Pack

Zitrades LED Strip Connector 4 Pin, Compatible with 10mm Width SMD 5050 RGB Strip Light, Strip to Strip Jumper (4PCS 2M Extension Cable Connect Female Plug and 8PCS Connectors Male)

Zitrades 10PCS LED 5050 RGB Strip Light Connector 4 Conductor 10 mm Wide Strip to Strip Jumper

10X L shape 4 Pin Connector JACKYLED 10mm Non-waterproof Quick Splitter Right Angle Corner Connector 12V 72W Clip for 3528/5050 SMD RGB 4 conductor LED Strip Lights Strip to Strip (22Pcs Clips)

Aiboo RGB Color Changeable LED Under Cabinet Lights Kit 8 Packs of Aluminum Slim Puck Lamps for Chirstmas Xmas Decorating Kitchen Counter Wardrobe Counter Furniture Ambiance Lighting