Basic Parameters: Outside diameter 20mm, ceiling cutout 29mm, height 40mm. Features a durable design with no paint peeling and no rust. Easy and safe to install. Each downlight comes with an included transformer. Adjustable light direction with a 360-degree rotating arm for precise spotlight positioning. Constructed from high-quality aviation-grade aluminum for superior heat dissipation and low heat output. Energy-saving with a service life of over 50,000 hours. Consumes significantly less energy compared to halogen bulbs, offering up to 90% energy savings. Provides brighter illumination than standard recessed lighting. Ideal for various indoor lighting applications such as living rooms, bedrooms, dining rooms, hallways, entryways, kitchens, retail displays, and decorative accent lighting. Suitable for use in residential and commercial settings.