【Basic settings】 Exterior: 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 focus of spot lighting. High-quality aircraft aluminum, perfect design; excellent heat dissipation, low heat generation. 【Energy saving】Over 50,000 Hours Lifespan - Energy Efficient Recessed Ceiling Lights: Up to 90% energy savings compared to halogen bulbs, over 50,000 hours 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, hallway, living room, bedroom, dining room, corridor and many other lighting applications.