Presonus Ceres C3.5BT 2-Way Powered Speakers with Bluetooth Bluetooth wireless audio streaming for use with smartphones, tablets, and other computers 3.5-inch Kevlar low-frequency transducer 1-inch (25 mm), ultra-low-mass, silk-dome, high-frequency transducer 25W/side Class AB amplification Treble and Bass Acoustic Tuning controls let you create a more accurate listening environment