Extension Speaker, Miniature, Automotive, Overall Height (In.) 4 1/2 in, Overall Width (In.) 2 1/2 in, Overall Length (In.) 5 1/2 in, Enclosure Color Black, Enclosure Material ABS Plastic, Tweeter Dia. (In.) 1 in, Woofer Dia. (In.) 12 in, Woofer Composition Treated Paper, 5 W Watt (RMS), Max. Wattage 10 W, Sensitivity (dB) 82 dB, Impedance (Ohms) 4 to 8, Frequency Response 150 Hz to 5 kHz, Weight (Lbs.) 1.6 lb, For Use With Amplifiers