Feature Highlights: 1. Dual Power Options – Powered via a universal Micro-USB 5V adapter or an external 3.7–5V lithium battery for flexible, portable use. 2. Clear LED Status Indicator – A steady blue light shows when Bluetooth mode is active and ready to pair. 3. Universal 3.5mm Audio Output – Standard stereo jack lets you connect headphones, speakers, or amplifiers easily. 4. Stable Wireless Connection – Bluetooth range extends over 15 meters for reliable, uninterrupted audio streaming. 5. Compact & Ready to Use – Small footprint (approx. 30×30mm), simple plug-and-play setup—no complicated installation needed. Product Details: This Bluetooth 5.0 audio receiver board lets you upgrade your wired speakers or headphones to wireless in seconds. It supports high-quality stereo sound with low noise and high signal clarity (SNR: 90dB). Compatible with A2DP, AVRCP, HFP, and other common Bluetooth profiles, it pairs quickly with smartphones, tablets, and other devices. Just power it on, connect via Bluetooth, and enjoy your music wirelessly. Perfect for DIY audio projects, car audio upgrades, or home stereo systems. Specifications: - Power Supply: 3.7–5V (Micro-USB or external battery) - Signal-to-Noise Ratio (SNR): 90dB - Crosstalk: -86dB - Dynamic Range (DNR): 91dB - Supported Profiles: A2DP, AVCTP, AVDTP, AVRCP, HFP - Operating Range: >15m - Connection: 3.5mm stereo audio output - Indicator: Blue LED - Color: Black - Material: Plastic - Size: Approx. 30×30mm Package Includes: 20 × Bluetooth decoder boards Note: Product color may vary slightly due to lighting and screen differences. Size tolerance is ±1–3cm. Other accessories are not included unless stated above.