You need to reserve a light line to install, 3 levels of dimming, the first time to turn on the light: white light, the second time to turn on the light: warm light, the third time to turn on the light: neutral light. Size: 23*20cm. Power: 13v STURDY&DURABLE: Our Stainless Steel Surface has a special Spray Coating that can pass the Salt Spray test for 300 Hours without rusting,Extend the service life greatly. SPECIAL CRAFT:Our Lampshade is made of a Special material which can prevent the damage from Ultraviolet light so that the color of lamp is not to be changed over long time under sunlight.The lamp uses an integrated LED module, which can not replace the light source. FREE REPLACEMENT: The life of the LED bulb is more than 30,000 hours. If the lamp doesn't work due to the bulb damage, we promise to give you a new lamp free of charge within 2 years. WHAT CAN YOU GET: High Quality Stainless Steel Wall Light,Fast Shopping Experience,2 Weeks Refund Guarantee(Non-artificial) and Friendly Customer Service.The lamp only works in a dark environment when its sensor detect people.