Novelty Lights, Inc. BAT20 LED Battery Operated Christmas Mini Light String Set, Green Wire, 20 Light, 8' Long 20 Light Multi Color Battery Light Set on Green Wire - 8' Long 20" Spacing From Battery Pack To First Bulb - 4" Spacing Between Bulbs Runs on 3 AA batteries (Not Included) - Tested For 35 + Continuous Hours On/Off and Twinkle (Flashing) Functions For Indoor/Outdoor Use - Commercial Grade Non-Removable LED Bulbs