I received the Liztek PSS-60 Ultra-Portable Wireless Bluetooth Speaker, in exchange for honest review from Tomoson. The Liztek worked with my phone, computer, and Kindle. The system comes with the speaker, charger, and a cord for a wired connection (just in case your device is not bluetooth capable.)
I do recommend turning off bluetooth mode for nearby devices. The speaker can connect to either one of them. For example, sometimes, it would connect to the computer before it connected to the phone.
The speakers come with volume control. It also allows you to skip between songs (on your default player only). For my computer, it's Google Play. For my Kindle, it's Amazon Prime Music player.
You can purchase the Liztek PSS-60 and other Liztek products on Amazon. The PSS-60 is prime-eligible and comes in multiple colors (Black and Blue).
I had no issues with the device, as of this point. The speakers produce great sound and is easy to use.