Monoprice 10951 Bluetooth Party Speaker Features an 8" woofer and 1/2" dome tweeter with a frequency response of 50 Hz ~ 20 kHz (3dB) Built in amplifier that can produce up to 50 watts on AC power and up 18 watts on battery power Five inputs: Bluetooth streaming, 3.5mm TRS line level, stereo RCA line level, and two 1/4" microphone Includes IR remote control Uses a lead-acid type powersports battery