It combined with smart touch screen technology and echo dot design,sensitive touch offers you funny control. Gently touching with your fingertip easily achieve switching the songs and volume control and taking the calls. Super compact design, 40mm 5w driver, 3d digital audio processor, with subwoofer resonator, loud sound. Equipped with the advanced technology, compatible with all bluetooth devices. And the phone can display the remaining power of the speaker ,speaker automatically reconnects to the last device used,connect your devices in just 3 seconds. The speaker will shut down when bluetooth is disconnected for 10 minutes, which is helpful to save power when the unit is accidentally left on. Built-in 1200mah high performance li-battery ,enjoy 12-15 hours of music at 50% volume, if you play it 1-2 hours every day at mid volume, it no need to charge in 2-3 weeks.