【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 for each downlight. 【Adjustable Light Direction】360 degree rotation arm for desired spot lighting focus. High quality aviation aluminum, perfect design; excellent heat dissipation, low heat generation. 【Energy Saving】Over 50000h lifespan - Energy efficient recessed ceiling lights: up to 90% energy saving compared to halogen bulbs, over 50000h lifespan. brighter than existing recessed lighting in your home. 【Ideal for Decoration】Ideal mini projector for indoor or home lighting, decorative room lighting, KTV rooms, TV cabinet showcase, hallway, living room, bedroom bedroom, dining room, hallway many other application lighting.