Feature: 1. Designed for use with audio amplifiers, DIY amplifier boards, and preamp effects. 2. Converts wired audio connections to Bluetooth wireless transmission. Equipped with the CSR64215 Bluetooth chip and supports Bluetooth 4.2 for stable, high-speed audio data transfer. Optimized for high-fidelity audio performance. 3. Supports aptX audio decoding for enhanced sound quality. Outputs standard analog audio signals. 4. Provides direct analog audio output compatible with front-end or rear-end analog amplifiers—no external DAC required. Ideal for DIY audio projects. 5. Includes auxiliary (AUX) input for external line-level audio sources. High-quality relays enable seamless switching between AUX and Bluetooth inputs without signal processing, preserving audio integrity. Color: Black Material: Plastic Specifications: 1. DC power input: GND (negative), +12V (positive); operating voltage range: 6–36V 2. AUX input: LINE_INR (right channel), GND (common ground), LINE_INL (left channel) 3. Audio output: R_OUT (right channel), GND (common ground), L_OUT (left channel) 4. Audio switching relay: High-reliability relay 5. Integrated Bluetooth antenna 6. Bluetooth status indicator (LED 1) 7. Bluetooth status indicator (LED 2) 8. QCC3008 Bluetooth solution with aptX support Package Includes: 1 × Bluetooth Receiver Board