Advanced Connectivity: Experience seamless audio streaming with A2DP/AVRCP support, allowing you to enjoy high-quality wireless music from your TV or car stereo system. Versatile Audio Decoding: Supports AAC decoding, ensuring compatibility with a wide range of devices and providing superior sound quality. Flexible Connections: Equipped with optical and 3.5mm jack outputs, this adapter can connect to a variety of audio systems and speakers. Compact and Portable: The A4's small size and design make it easy to carry and install anywhere, providing a perfect audio solution. Specifications: Product model: A4 Bluetooth version: V5.1 Support protocol: RX: A2DP/AVRCP, TX: A2DP Frequency range: 2400–2483.5 MHz Sensitivity: -81dBm (less than 0.1% BER) Transmission distance: Up to 10 meters (barrier-free) Frequency response: 20Hz–20kHz Signal-to-noise ratio: ≥75dB Audio performance: AAC decode Interface type: Aux in/out 3.5mm audio ×1, L/R Basic function: Bluetooth receiver / Bluetooth transmitter Use method: Plug and play Supported equipment: Mobile phone, tablet, PC, TV, speaker, amplifier, headset, projector, mixers, and other devices with audio input/output interfaces Power supply mode: Type-C interface Input parameters: DC 5V 500mA (1A max) Battery capacity: 3.7V/800mAh 2.96Wh Usage time: Approximately 5–7 hours (charging time: about 2 hours) Color: Black Material: ABS Note: Due to different production batches, there may be slight variations in product appearance and printed text, which do not affect functionality. Package Contents: 1 × Bluetooth audio adapter 1 × AUX 3.5mm audio cable 1 × 1-to-2 3.5mm audio cable 1 × USB-C charging cable 1 × Fiber optic cable 1 × Antenna 1 × Remote control Note: Light reflection and differences in display screens may cause slight color variations between the item and the image. Measurement error is permitted within ±1–3 cm.