You can also connect two speakers for stereo sound that fills the room, providing ultra-clear 3D stereo surround sound with less than 1% harmonic distortion, built-in FM radio and Micro SD/TF card slot. [High Quality Battery] 5000MAH Outdoor Speaker: The smart speaker is equipped with a 5000mAh rechargeable battery, which can play music at 50% volume for up to 20 hours (playback time varies depending on volume and audio content). You can even use this speaker to charge your smartphone, so you don't have to worry about your device crashing while listening to music. The stylish design is easy to carry or place in the room as an ornament, so this speaker is the best choice for listening to music from day to night. ?Up to 20W high-power audio speaker and widely connected intuitive multi-function control dial?Use simple symbols "+" and "-" to control volume. Press to play and pause music and hands-free calls. Press and hold for 3 seconds to activate the voice assistant. The range of the waterproof wireless speaker is about 66 feet. It can also connect to non-Bluetooth devices via the included 3.5mm audio cable, and the speaker will switch to AUX mode.