【 Necessary configuration 】To make the LED backlight shee working, 24V power supply is needed (24V DC power supply is not included), If your power supply has a dimmer function or you do not need a dimmer, the controller is not needed. Amplifier is needed when you use the controller and the LED sheet is over 6pcs. ATA is recommended and can be found on Amazon. 【High Brightness & Flexible & Cuttable】Each flexible led panel sheet measures 19.7X9.7 inches. With min cut size 0.87'' x 0.87'' ( 22mm x 22mm) 28W of power while emitting an impressive 3600 lumens of light. With a remarkable CRI of 95+, you can count on stable, enduring brightness and true-to-life colors. Best when used behind natural stone or quartz. 【Easy to Install 】Our modular flexible backlight sheet comes with all the accessories for a easy setup(24V DC power supply is not included), these includes 4 pcs LED sheet, total 5 square feet. 8 pcs short connect line each is 2.5-inch length, 8 pcs long connector line each is 6 inch, 32 spacer/ standoff, 1 installation manuals. so you're fully equipped for a smooth installation process.. The led light sheets provide 3M adhesive and screws mounting. the total distance should not exceed 6.5 feet from the power source input to the farthest end of any interconnected sheet 【Ideal Backlighting for Semi-transparent Countertops】Ata LED light sheets are commonly used to back-lite translucent stones such as quartz, onyx, agate, marble, natural stone, scenes such as kitchens, bars, reception desks, etc.Note light spots if your countertop is glass or thin 1/4” (＜7mm). Opt for natural stone thicker than 3/4”(19mm). Test how your surface reacts to light beforehand. 【Long-lasting Work Life & Worry-free after sale】High quality LED ensures 50,000 hours life span. This flexible LED Backlight Sheet INPUT VOLTAGE：24V DC WATTAGE：28W Color：6000K 2800 lumens/PCS CRI：95+ Dimension：19.7" L x 9.7" W Cut Increments：Every 22.30 mm (0.87”) Dimmable ：YES Mounting Methods：3M Double Sided Tape or Screw on Life span：>50,000 hours Enviroment：IP20