A butterfly lid consists of two hinged panels that meet at the center and either fold inward or retract when opened. That center-opening action gives extra clearance under low countertops and in narrow spots, letting the can fit into tighter spaces than a single, top-hinged lid would.
Common operation methods are hands‑free sensor (wave) activation—usually battery‑powered—and foot‑pedal (step‑on) operation. Some models offer dual power options, for example battery operation with an available AC adapter.
Noise is commonly reduced with soft‑close or slow‑close lid mechanisms to prevent slamming. Odor control comes from tight‑sealing or fully sealed butterfly lids that trap smells inside; some listings explicitly describe odor‑sealing designs.
Slim, narrow profiles and the center‑opening or inward‑retracting butterfly lids are the main elements that provide extra clearance and allow placement under low countertops or in tight spaces.
Care instructions vary by model: common recommendations are spot‑clean or wipe down with a damp cloth and, in some cases, clean with water. A few product specs do not provide specific care instructions.