Common power options include AA battery packs, USB power, and solar panels with a built-in rechargeable lithium battery. Many models offer dual-power configurations (for example USB plus AA batteries) so you can choose the most convenient power source.
Typical modes include steady/constant, flashing, fading, twinkling, and chasing, plus other preset programs. Some listings specify 8 selectable modes, while others offer up to 16 settings.
Lengths range from a few feet up to about 30 feet in the examples given. Bulb spacing commonly falls between roughly 2 inches and 10 inches, depending on the strand style.
Several lights include an on/off switch plus a timer—common examples use a 6-hour on/18-hour off cycle or an auto shutoff after 6 hours. Some options also come with a remote to change modes and adjust brightness.
Curtain and vine-style lights commonly use multiple strands with higher LED counts—for example, sets shown with 8 strands and 128 LEDs or 6 strands with 66 LEDs.
Some curtain-style sets include mounting clips or other basic mounting hardware. A few listings also note that the light bulbs are included as part of the set.