PORDUCT FEATURE: The Light is made use of original material purely handmade. It contains 2 USB Light kit Instruction guide battery box and 1 USB connector. Plug in power and light up your building blocks with our amazing design! TIPS: Prepare three AA Batteries or USB Charger and Voltage should be less than 5V to avoid burning. Manufacturered by LIGHTAILING. INSTALLATION INSTRUCTION: The light set installation is done to your preference. Please install your led light carefully no hard pulling and no need to bend or shake it. ABOUT US: Specialized in custom-designed Lighting Kit toys we aim to supply customer with good products and quality services. Make your creations unique with your rich imagination and creativity. Let 's light up your bricks and bring them new vitality. If you have any problems please do not hesitate to contact us. Have a happy shopping experience! USAGE: The Light Set is used to light up Friends Heartlake Hospital (NOT include the Lego Set).