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Installation instruction: http://img.banggood.com/file/products/20180110030354HBL-22-heart-shaped-breathing-LED-kit-.pdf Feature: Kit model: HBL-22 Working voltage: DC4--6V PCB size: 50.7 x 50.7mm Package weight: 23g Color: Blue LED Speed adjustable Package includes: 10 x DIY blue led kit