For indoors & out, this set of soft-white bulbs is great for stringing around a tree inside or out, & has a timer function (on for 6 hours, off for 18 hours). 8 functions including twinkle & static Takes 3 x AA batteries (not included), battery life approx. 150 hours twinkling, 85 hours static Green flex, soft white bulbs 96 bulb set: total length 7.6m of which 7.3m is illuminated 160 bulb set: total length 13m of which 12.8m is illuminated