?Hassle-Free Service?: When you purchase the MARBOO USB Powered Speaker, you'll receive a quick start guide and our friendly 18-month replacement plus lifetime customer service. This makes your purchase absolutely risk-free and pleasant, so you can buy it with confidence. ?No Built-in Battery:?Plug & Use, MARBOO Bluetooth computer speakers for desktops have no built-in battery. Just plug the USB into any power source and it will auto-turn on.No drivers or software that need to be installed, just plug in and enjoy. ?Volume & Lighting Control?:Four buttons on the back of the speaker are the “Mode Switch”/volume up/pause & lighting control /volume down buttons. ✓Short press “MODE” to switch Bluetooth modes, and long press to switch on and off.✓ Long press “?” to reduce the volume, short press “?” to switch previous song .✓Short press “?” to play and pause, long press “?” to control the light (turn off/on the light).✓Long press “?” to increase the volume, short press “?” to switch next track. ?Compatible with any Bluetooth-enabled Device?:Bluetooth 5.3 & AUX-in Connection, Devices with Bluetooth can be connected by Bluetooth. And most devices with a USB can connect by AUX. This Bluetooth computer speaker is compatible with laptops, desktops, PCs, phones, tablets, Xbox, and PS4. ?Chip Technology?:Compared with other Bluetooth speakers, Our MARBOO computer speakers use the latest technology chip, it can achieve low latency, low power consumption, wide compatibility, stable Bluetooth connectivity, and more realistic stereo sound for a better customer experience.