Pre-lit spruce trees typically use LED or incandescent bulbs. Most models are electric (plug-in). One listing noted a battery-powered component that requires batteries (not included).
Lighting functions range from constant/steady-on to twinkle/twinkling and slow-glow or fade-style effects. Some models offer multiple preset modes (e.g., three or eight modes), and at least one model lets you select clear, multicolor, or both color settings.
Foliage is typically PVC (polyvinyl chloride) needles or branches. Some trees use PE (polyethylene) tips or a mix of PE + PVC tips to achieve a more lifelike appearance.
Common safety features include flame-retardant or fire-resistant PVC branches and stable stands. Some listings call out foldable stands with non-slip or padded feet and other stand protections to improve stability and prevent floor damage.
Commonly included accessories are a metal or steel tree stand and pre-strung lights. Some listings also include extras such as protective gloves, spare bulbs, storage bags, and a remote for light settings.