This 20 watt bluetooth stereo speaker sounds great while doing it in a small portable for factor. The small size allows you to take it anywhere while the 24 hour battery will let you play the music on and on. The micro SD card slot allows you to play your books or music right from the micro SD card. The audible and voice feedback let's you know what's going on every tstep of the way. The bass mode puts more punch through the spekaer and you can connect two of these via true wireless for a real big 40 watt stereo sound! The built-in speaker allows you to make or take calls and even redial the last number called right from the speaker. There is an elastic cord on the side of the speaker for carrying or hanging. The optional light show will display lights with the music. The easy to feel controls on top allows for turning the volume up or down, skipping tracks backwards and forwards, playing and pausing music, answering calls, switching from normal to bass mode, and adjusting the light display. This little thing really does a lot! The water resistant speaker let's you take it to the beach or by the pool with no problem.
Features:
has crystal-clear stereo sound and a balanced base. Delivers 20W sound with its two full-range drivers and passive radiators. Compact size to hold easily in hand or hang on your backpack for bring with for travelling outdoors.
20 hour battery with lights turned on and 24 hour battery with the lights turned off.
Bass boost mode
IPX7 water resistance
elastic strap for carrying on your wrist or haning on a bag
Micro SD card slot
Bluetooth 5.0 technology ensures seamless connection up to 66 feet away. 
Easy to feel controls
Connect 2 of these via true wireless mode for a left and right channel stereo sound
Audible and voice feedback
Small and portable
Controls:
Hold down on the light button for a few seconds to turn off the light show
Press the bass boost mode button once to activate bass boost and a second time to switch back to normal mode.
Press the volume up button and the volume down button once to adjust volume.
Hold down on the volume up or down button to skip forward or backwards tracks.
Press the play button once to pause music and again to resume.
Hold down on the play/pause button to redial the last number called.
Press the play button once to answer an incoming call.
Hold down on the bass boost button to enable true wireless mode with a second speaker turned on and nearby.
Hold down on the bass boost mode again to take the speakers out of true wireless mode.
Hold down on the power button to turn the speaker on and hold it down again to turn the speaker off.
What's included:
20 watt bluetooth speaker
USB to USB type C charging cable