PreSonus Eris E4.5 BT 4.5" Powered Studio Monitors with Bluetooth - Pair. 4.5" Powered Studio Monitor with Woven Composite Woofer, 1" Silk-dome Tweeter, 50W Class AB Power, Acoustic Tuning Controls and Bluetooth Connectivity. Choosing the right pair of monitors for your home studio can turn a good mix into an incredible track. That's where the PreSonus 4.5 Eris Series Active Bluetooth Monitors come in. Whether you're gaming, mixing, or mastering, these compact monitors create accurate sound reproduction without the cables! These monitors have 4 different types of audio connections (1/4" TRS, RCA, 1/8" stereo, and Bluetooth) that let you dish out audio from almost any source, including smart devices. You'll also find manual acoustic tuning knobs on the back of the units to optimize them for your acoustic environment. To make sure you get the most out of your monitors, choose the Eris 4.5 Active Bluetooth Monitors from PreSonus. What's in the box Eris E4,5 BT Monitors Power Supply Interconnecting Cable RCA to 3.5mm Cable 3.5mm to same Cable Foam Corner Pads PreSonus Sticker