【Basic Settings】Outer: 20 mm, ceiling cutout 29 mm, Height: 40 mm; no paint falling off and no rust. It is easy and safe to install. Transformer included, one transformer for each downlight. 【Adjustable Light Direction】 360-degree rotating arm for desired spotlight focus. High-quality aviation aluminum, perfect design; excellent heat dissipation, low heat generation. 【Energy saving】 Over 50,000h Lifespan - Energy-saving recessed ceiling lights: Up to 90% energy savings compared to halogen bulbs, over 50,000h lifespan. Brighter than existing recessed lighting in your home. 【Ideal for decoration】Mini spotlight ideal for indoor or home lighting, room decorative lighting, KTV rooms, TV cabinet showcase, entrance hallway, living room, bedroom, dining room, corridor and many other application lighting.