Vickerman 35 Light LED Battery Operated Warm White Wide Angle Christmas Light set featuring Green Wire, 24 gauge Wire, 12″ Lead, 5″ Spacing, Multi Function Battery Box W/Timer(4/6/8Hrs On) And Photo Sensor Press Buttonwhich means lights will come on at dusk and turn off at dawn, Requires 2 C Batteries (Batteries Not included) Using 4hrs on; 20hrs off timer – good quality battery life is expected to last for up to 25 daysUsing 6hrs on; 18hrs off timer – good quality battery life is expected to last for up to 20 days- Using 8hrs on; 16hrs off timer- good quality battery life is expeced to last up to 18 days. For indoor use only.