1. Plug-and-Play Bluetooth Audio Receiver: Multiple interface options (3.5mm AUX, coaxial, optical fiber) enable easy Bluetooth connectivity for legacy audio devices. 2. Supports Bluetooth audio receiving mode with 3.5mm AUX, coaxial, and optical fiber audio outputs; includes multi-device expansion capability for enhanced connectivity. 3. Connects to older speakers or power amplifiers via 3.5mm AUX, coaxial, or optical fiber inputs—ideal for adding Bluetooth functionality to non-Bluetooth audio equipment. Compatible with a wide range of legacy audio amplifiers and speakers. Features strong, low-latency signal transmission and aptX-HD high-fidelity decoding for CD-grade sound quality. 4. aptX-HD technology delivers high-resolution, lossless audio performance over Bluetooth, providing a wireless listening experience comparable to wired connections. 5. Equipped with Qualcomm Bluetooth 5.2 chipset for stable, low-latency wireless transmission and superior audio signal restoration. Note: This is a Bluetooth audio receiver only—not a transmitter. Designed exclusively for audio playback; not compatible with keyboards, mice, or file transfer devices. Product Name: aptX-HD Bluetooth Audio Receiver Model: D300-HD Bluetooth Version: Bluetooth 5.2 Interfaces: 3.5mm AUX, coaxial, optical fiber (single output at a time) Operating Range: Up to 15 meters Charging Port: USB-C Battery Capacity: 500 mAh Playback Time: Up to 10 hours Supported Codecs: aptX, aptX-HD, SBC, AAC Frequency Range: 2400–2483.5 MHz Frequency Response: 20 Hz – 20 kHz Compatible Devices: Wired speakers, home speakers, power amplifiers, headphones, car audio systems, etc. Type: Bluetooth Audio Receiver