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 Direction 360 degree rotation arm for desired spot lighting focus. High quality aviation aluminum, perfect design; excellent heat dissipation, low heat generation. Energy Saving Service life over 50000h - Low consumption recessed ceiling lights: up to 90% energy saving compared to to halogen bulbs, lifetime greater than 50000h. brighter than the existing recessed lighting in your home. Great for DecorationIdeal mini spotlight for indoor or household lighting, decorative room lighting, KTV rooms, shop window from TV cabinet, entryway, living room, bedroom, dining room, hallway to many other application lighting.