- Bluetooth 5.0 Technology & Support TF Card/AUX/USB Playback: This mini retro bluetooth speaker has a built-in wireless function that allows you to connect various Bluetooth-enabled devices (such as smartphones, laptops, etc.) to play music. Bluetooth 5.0 technology provides a long-range connection of 33 feet. Giving you the freedom to transfer music wirelessly. In addition, there are TF card playback mode and support for 3.5mm cable input mode for desktop computers or playback devices without Bluetooth.