Bluetooth 5.0 TechnologyThe AK3040R Pro receiver for home stereo is equipped with a Bluetooth 5.0 chip, which guarantees high fidelity transmission of Bluetooth audio signals for music streaming to speakers or a non-functional home stereo system. LDAC High Definition Bluetooth AudioLDAC Bluetooth Audio Adapter transmission supports streaming high-resolution audio over Bluetooth connections at up to 990 kbps (higher than aptX & aptX HD), thus greatly reducing the sound quality loss caused by Bluetooth transmission. Introducing Wireless Bluetooth to audioeppfun Bluetooth Adapter can be connected to the old non-Bluetooth receiver, wired retro stereo, speaker, wired headset, car stereo via the 3.5mm AUX/RAC jack, giving old devices a whole new life! NOTE: This product is a receiver only, NOT a transmitter. 3D Surround Sound FunctionThe featured 3D button is designed to have an engaging sound experience with deep dynamic bass. You can switch 3D mode to enjoy 3D surround sound from a regular audio source. The green LED will be on when switched to 3D audio. Easy Pairing and Connection Connection power supply You can connect by directly entering the pairing mode, turning on the Bluetooth of the smartphone, and selecting LE506. RX continuous playback: 12H (Max) Reception distance: Indoor 12m (Max).