Review on IPX7 Waterproof Portable Bluetooth 5.0 Speaker with Mic for Hand Free Calls, Louder Volume and 15W Stereo Output, 12-Hour Playtime, 80-Ft Wireless Range, Pulsating Lights – Perfect for Home Parties and Music – Black by Virgilio Patton

I also found a feature of this speaker that is not even mentioned in the product description nor in the little manual that comes with the speaker. The micro SD card slot labeled "TF" is under a rubber pad on the left side of the speaker under a thick black border. I'll buy a micro SD card and try it! The instructions are not the best in a small manual, but for playing music it is enough, the answering machine thing is not very clear. used the speaker for about 4 hours and the battery life is still good. I don't know how long it will take. This is a dual speaker design, with a subwoofer on the side of the light and a large speaker on the other side. The buttons at the top are hard to read and should have been a color other than black. I will try to color them with a permanent white marker. Playing music gives me many options, a micro SD card, bluetooth and a 3.5 mini jack to connect to anything. I like the micro SD card option as you don't have to worry about your phone running out of power. Considering the price of this device and the excellent sound, I highly recommend this speaker. THUMBS UP!