Command attention in any room with this concerto speaker and power bank! Recipients can charge phones and listen to tunes from the passive radiator for bass boost in the wireless speaker. The power bank has a standard USB port and 4400 mAh lithium ion, grade A, non-recycled battery. The wireless speaker has high definition Bluetooth 5.0 technology with low-energy consumption. Users can pair their device for dynamic stereo sound for up to 15 hours of play time. There's a built-in microphone for easy hands-free calling, dual five-Watt speakers for rich playback, carrying strap, LED lights that indicate battery status and accessible controls for song control and volume. It has a non-slip scratch-resistant base and is water-resistant, making it ideal for home, office or outdoor activities!