The RCA Surround Sound Speakers RTB1023 in black are a set of 5 cube-shaped speakers designed for a 5.0 channel surround sound system. These speakers are compatible with universal brands and specifically designed for RCA products. With a 1-inch driver size, these wired speakers offer Dolby Digital surround sound formats and have an impedance of 4 Ohms. Manufactured in 2017, these plastic speakers are a great addition to any home audio setup for a clear and immersive sound experience.