WINOMO Cotton Ball 20-LED Battery Powered String Lights for Decoration - Grey Serial Color: Grey serial. Material: Durable plastic and cotton. String length: about 2.2 meters. Powered by 3 * AA batteries. Cotton ball shaped LED string lights, adopting 20 LED bulbs as light source to give off light. Good insulating property, more safe to use, and low power consumption for saving energy. Suitable for decorating Christmas, New Year, other festivals, Wedding background layout, parties, garden, hotels, bars, club, dance halls, shops, and so on.