Besides music playback via Bluetooth, this portable Bluetooth speaker also offers the option of connecting the speaker to a player via a cable or listening to music from a microSD card. The built in microphone means you can also use it to make hands-free phone calls. Niceboy SOUNDtube is fitted with a water- and dust-proof IPX4 cover. The built-in 10-watt speakers deliver full and clear sound. The speaker has been fitted with a large-capacity battery (2200 mAh) offering 7 to 9 hours of music. It can be used as a power bank to recharge additional devices, such as mobile phones, etc.