STUDIO SOUND QUALITY - Equipped with 1 silk dome tweeters and 4 long-throw mid-low drivers, you can enjoy crystal-clear audio and have an immersive listening experience with the R990BT speakers. BLUETOOTH V5.4 - The Bluetooth Version 5.4 audio receiver provides a reliable way to stream audio wirelessly with a strong and uninterrupted connection. DUAL RCA INPUT PORTS - The dual RCA input ports provide the convenience of connecting two separate devices at the same time through the use of audio cables. EASY TO CONTROL - The R990BT speaker is designed with a rear-mounted control knob and button, allowing users to easily control the various functions of the speaker with ease and precision. CLASSIC MDF ENCLOSURE - High-quality MDF cabinet can reduce distortion and resonance. The MDF enclosure has a sleek black finish, making the speaker a stunning addition to any living room, office, or study room.