Cool! The sound is loud. Bluetooth range is great. The app has its own volume control that is separate from my device's volume control. Very good sound quality and volume for this small device. What worries me is that the app requires that you not only have Bluetooth (music/media) turned on, but also have GPS tracking turned on for the bulb to work. GPS tracking is not required for most other Bluetooth devices that are similar. If you need my location to turn a lightbulb on or off, it's not worth giving up my privacy.