Wired speaker device (Portable Rechargeable Speaker) branded BTC For Sound's Systems Key specifications and features of the device: Wireless Connectivity: Supports Bluetooth technology for pairing with phones and smart devices. Multiple Ports: Usually includes a USB input and SD/TF Card playback, in addition to an AUX port. Karaoke System: Equipped with a microphone input that supports playing karaoke systems and home parties.