Basic Parameters Outside: 20mm, ceiling cutout 29mm, Height: 40mm; no paint fall off and no rusty. It is easy and safe to install. Transformer included, one transformer of each downlight. Adjustable Light Direction360 degree rotation arm for desired spot lighting focus. High quality aviation aluminum, perfect design; excellent heat dissipation, low heat generation. Energy Saving Service life more than 50000h - Low consumption recessed ceiling lights: up to 90% energy saving. energy saving compared to halogen bulbs, lifespan over 50000h. brighter than the existing recessed lighting in your home. Great for Decoration Ideal mini spotlight for indoor or home lighting, decorative room lighting, KTV rooms, TV cabinet showcase, entrance hall, living room, bedroom, dining room, hallway many other application lighting.