Compact Bluetooth 5.4 Audio Receiver

Physical specs: 52 × 24 × 14 mm; weight 28 g. Constructed from UL94-V0 rated heat-resistant polymer. Power: draws 5V DC via USB only — no external power source or batteries needed. Audio outputs: one USB Type-A (audio data out, not charging), one 3.5mm TRS stereo jack (line-level output, impedance-matched for consumer audio gear). Bluetooth version: 5.4 compliant with EDR (Enhanced Data Rate), supporting SBC codec only — no AAC or LDAC. Pairing: supports one device at a time; automatic reconnection occurs within 1.8 seconds of power application if previously paired. Indicator: monochrome blue LED — solid = connected, slow pulse = pairing mode, fast blink = connection lost. Signal processing: onboard low-pass and common-mode filters reduce high-frequency noise coupling from vehicle electrical systems.