A dark room is, with my more than 50 lights in this series, after a hard day at work, a romantic and soothing interplay of colors. Almost everywhere applicable, but not waterproof. Very energy efficient. The battery (a 3V lithium coin cell CR 2032) raises now been over 24 hours and is, when you order in large quantities, here at Amazon very favorable. Unfortunately, the quality (processing), although functional, but only on Asian standard. That is why only 4 stars. Very fast and well packaged delivery. Greetings from the gray wolf.