Feature: Specification: Features: High-performance BT Chip: Equipped with the BT5.3 chip, this wireless BT audio receiver ensures stable and quick transmission, allowing for a wider signal ranges and retaining more sound details. Say goodbye to audio lag and enjoy a smooth listening experience. Smooth Connection and Wide Compatibility: With its AUX interface, this device can effortlessly convert wired audio signals into BT signals, delivering them to various BT-enabled devices such as car stereo systems, home speakers, headphones, and more. Enjoys the convenience of wireless connectivity wherever you go. Hands-free Calling and Clear Sound Quality: The built-in microphone enables smooth hands-free calling, providing clear sound quality. Answer, reject, hangup, or redial calls with just one button, ensuring safety and convenient communication on the road. Versatile Functions and TF Card Slot: Upgrade your car audio system with BT functionality and enjoys features like navigation, hands-free calling, and musics playback. The built-in TF card slot allows you to listen to your favorite songs even without a smartphone by your side. Compact Design and Long Endurance: Made from strong ABS material, this audio receiver is lightweight and portable, making it easy to carry wherever you go. The built-in rechargeable battery boasts a long endurance of 6-7 hours and supports quick charging via the Type-C interface, allowing for a full charge in just 25 minutes. Specifications: Color: Black + Grey Material: ABS BT Version: BT V5.3 Battery: Built-in 120mAh Lithium Battery Working Time: 6-7 Hours Charging Time: 25Min TF Card Expansion Capacity: Support up to 64G Item Size: 46 * 31 * 16mm/ 1.8 * 1.2 * 0.6in Item Weight: 12g/ 0.4oz Package Size: 127 * 92 * 20mm/ 5.0 * 3.6 * 0.8in Package Weight: 44g/ 1.6oz Packing List: 1 * BT Receiver 1 * AUX Adapter 1 * Power Cable Package List: 1 * BT Receiver 1 * AUX Adapter 1 * Power Cable