Amplifier Bluetooth Compatible No Color Black Includes Volume Control Number of Input Ports 1 Overall Depth 4 1/4 in Overall Height 1 5/8 in Overall Width 4 7/8 in Product Type Amplifier Resistance Properties Waterproof Speaker Maximum Frequency Response 20 kHz Speaker Maximum Impedance 8 ohm Speaker Minimum Frequency Response 20 Hz Speaker Peak Output Power 25 W Watts per Channel 50 W