【basic settings】Outside: 20mm, ceiling cutout 29mm, height: 40mm; No paint falling off and no rust. Installation is easy and safe. Transformer included, one transformer for each downlight. 【Adjustable light direction】 360 degree rotating arm for desired focus of spot lighting. High quality aviation aluminum, perfect design; excellent heat dissipation, low heat generation. 【energy saving】 Lifespan over 50,000 hours - Low consumption recessed ceiling lights: up to 90% energy savings compared to halogen lamps, lifespan over 50,000 hours. brighter than existing recessed lights in your home. 【Ideal for decoration】Mini projector, ideal for indoor or home lighting, decorative room lighting, KTV rooms, TV cabinet display case, entryway, living room, bedroom, dining room, hallway and many other lighting applications.