Fusion MS-OS420 Marine Compact Box Speakers (Pair) 100 Watts Peak Power, 25 Watts RMS Power Efficiency (1W/1M): 86dB, Frequency Response: 80Hz - 20kHz Impedance: 4 Ohm 4" Polypropylene/NBR Surround Woofer, PEI Cone Tweeter Speaker Pair, includes Adjustable Wall mounting bracket Dimensions: 5 3/8"W x 7 7/8"H x 5 7/16"D not including bracket