Feature Highlights: 1. Versatile Connectivity – Equipped with a 5mm interface and Bluetooth 4.1, this adapter supports 2-in-1 pairing for headphones, phones, speakers, and car audio systems. It works as a Bluetooth receiver, car Bluetooth receiver, AUX Bluetooth adapter, and audio converter. 2. User-Friendly Operation – Features clear voice prompts (Chinese/English, default English), call number display, and smart low‑power reminders. Auto‑shuts down after 5 minutes in pairing mode to save battery. 3. Easy Controls – Power on/off with a 5‑second button hold. Adjust volume with +/- buttons. Manage music (play/pause, skip tracks) and calls (answer/end) with simple presses. 4. Clear LED Indicators – Flashing red/blue during pairing, slow blue when connected, and red warning for low battery. 5. Long‑Lasting & Portable – Built with a rechargeable 80mAh lithium battery (approx. 250h standby, 10h call time). Compact ABS design, weighs only 25g, and offers stable connection up to 15m. Product Details: This wireless Bluetooth audio adapter lets you upgrade wired speakers, headphones, or car aux systems to wireless Bluetooth instantly. It supports HFP, HSP, A2DP, and AVRCP protocols for clear calls and high‑quality stereo audio. The intelligent noise reduction ensures crisp sound during calls. With plug‑and‑play setup, no drivers needed—just pair and play. Ideal for cars, home speakers, or headphones. Specifications: - Interface: 5mm AUX - Bluetooth Version: 4.1 - Battery: 80mAh rechargeable lithium polymer - Standby Time: ~250 hours - Call Duration: ~10 hours - Wireless Range: Up to 15m (49.2ft) - Frequency: 2.4Hz - Supported Protocols: HFP/HSP/A2DP/AVRCP - Material: ABS - Color: Black - Weight: Approx. 25g (0.9oz) - Package Includes: 1x Bluetooth Adapter, 1x 3.5mm Audio Head, 1x USB Cable, 1x Instruction Manual