Auto-Partner 12V 220V 110V HiFi Digital Amplifier Max Power 90Wx2 Channel 20 Bluetooth Surround Sound AMP Speaker AK45 Feature: -Mini HIFI digital bluetooth audio power amplifier. -Add single cycle button to cycle favorite music easily. -SD / USB interface, 2 Mic inputs, With Remote control. -TF Card, AUX, U disk, MP3 format play, support bluetooth wireless connection. -Supports FM stereo radio, Mp3 media Player. -With treble, bass, and volume control, very easy to use. Specification: Color: Black Model:AK45 Voltage: DC 12V or AC 90-240V Impedance: 4-16 Bluetooth: Support RMS power: 40Wx2 Peak power: 90W x2 Channel: 2.0 SNR: 85 db FM Frequency: 87.5-108MHz Frequency: 10Hz-20KHz Battery for Remote: CR2025 x1(Not Included!) Size: Approx. 18x14x6.5cm/ 7.09x5.51x2.6'' TIPS: For optimal effect, the rated power of single speaker should not exceed 35W. Not a professional radio, pls don't expect too much. more questions, pls contact us for help. If want to use DC power, pls use 12V/5A adapter. Only 1 power method can be used at any time ! Package included: 1x Power Amplifier 1x Remote Control 1x Power Cord 1x Radio Antenna 1x Manual Book Note: The battery for remote is not included, Pls buy it yourself.