The housing of the battery bulb is made of ABS plastic and the "bulb" is made of PP plastic. It is heat and cold resistant, has excellent electrical insulation, and has a long bulb life. : Each pack comes with 4 battery bulb lights, yellow, purple, blue and green, they can be bundled together or decorated individually. You can decorate your home with the perfect balance of colorful style and durability. : The battery powered light bulb cord is connected to the light switch, pulling the cord turns the LED battery light bulb on and off. Adjustable shoulder straps, lightweight design, suitable for any scene. It is perfect for outdoor and indoor activities. : Battery powered bulbs require 3 AAA batteries (not included) for convenience in areas without plugs. Cool white LED lights consume less power, last longer and save energy. : Battery pendant lights provide lighting and decoration for backyards, barbecues, Christmas parties, holiday celebrations, weddings, birthdays, camping and any environment that needs lighting.