Features: Built-In 15W per Channel Amplifiers, 2-Way, 2-Channel, Bass-Reflex Design, 2.75-inch Kevlar Woofer, 0.75-inch Silk Dome Tweeter, 65 Hz to 22 kHz Frequency Response, Bluetooth with aptX HD Connectivity, Stereo RCA, 3.5mm, Micro-USB Inputs, Stands Constructed from Silicone Rubber, 15° Vertical Tilt with Stands