The City Link (SmartLink) is perfect for indoor and outdoor illumination lighting such as decoration lighting, stairway illumination, bar table illumination, table bottom side illumination, accent lighting, store signs, letter board sign and they are ideal for under cabinet, light box, signage and illuminated advertising or back-light signage usages. It is waterproof, there is no adapter (power supply) required as it utilizes residential electrical power (120V AC).