Listen to your favorite playlist with the Caliber HPG430BT Bluetooth speaker. Thanks to Bluetooth technology, you can easily connect your smartphone to the wireless speaker. Prefer not to use Bluetooth? You can also play music via USB, SD, and Aux connections. With this Bluetooth speaker featuring a built-in microphone, you can enjoy crystal-clear phone calls. Additionally, the PowerBank function allows you to charge your smartphone through the wireless speaker. For more volume, use the TWS pairing function to connect two Caliber HPG430BT speakers.