Features: Experience the freedom of highly fidelity auditory with the BX-2, a portable Wireless V4.0 Receiver that transforms equipped sound system into a wireless powerhouses. Featuring an advanced V4.0 chip for seamless connectivity, the BX-2 offer plug and play convenience and a built in 3.7V lithium battery for up to 10hours of uninterrupted wireless performances. For audiophiles, home theater enthusiasts, and professionals seeking to eliminate cable clutter and upgrade their existing sound systems to wireless technology. Perfect for use in home entertainment setups, car auditory systems, or commercial spaces like conference rooms where highly quality auditory transmission is essential. The BX-2 not only delivers superior sound quality but also boasts a compact design, one button control for ease of use, and compatibility with a wide auditory devices, ensuring listening experience wherever you go. Specifications: Item：Wireless V4.0 Auditory Receiver Model: BX-2 Component: ABS Size:about Inside: 3.7V lithium battery Rechargeable Charging： Micri USB 5V Package Includes: 1PC BX-2 Auditory Receiver note: Due to problem of lighting effect and shooting, there might be tolerances in product, please understand. Please allow 0-1cm error due to the measurement.