Yamaha Bluetooth speaker. Not portable, no internal battery. Features: The DTA Controller app lets you control basic and advanced functions for a richer experience. [ Remote Control ] Turn lights on or off and adjust intensity across a range of ten brightness levels, as well as control volume. [ Smart Timer ] Set timers to turn audio and lights on or off at different times, even on specific days of the week. [ Music Player ] Select and play music right from your smartphone or tablet. Control the equalizer. Designed for the shelf, the LSX-170 contains two speakers that point upward. Both audio and light are diffused horizontally over a 360-degree range, and this feature lends the LSX-170 its iconic form. We designed the entire product to express this circle of light and sound. Two rings of light appear, symbolizing the widening circle of sound. The six LEDs arranged in a circle around the base of the unit create a glowing halo effect as if the unit is lit by spotlights on a stage, resulting in an almost mystical appearance that brings out the inherent spirituality of music.