Note: Manual measurement has 1?2cm error. Specification: Item Type: Power Amplifier _x000D_Material: Aluminum Alloy_x000D_Power Amplifier Size: Approx. 9 x 11 x 3cm / 3.5 x 4.3 x 1.2in_x000D_Screen Size: 1 inch_x000D_Memory Card Type: Memory Card U Disk_x000D_Expansion Card: Support_x000D_Mode of Operation: Push Button_x000D_Interface: USB 3.0_x000D_Headphone Jack: AUX Input_x000D_Support Audio Formats: MP3, WMA, WAV, FLAC, AAC, APE_x000D_Screen Color: Monochromatic Screen_x000D_Screen Resolution: 160 128_x000D_Remote Control: Infrared Control, Shipped with Built In Battery (Battery Model: Button Battery, CR2520, Capacity: 150mAh)_x000D_Frequency Response Range: 20-20_x000D_Menu Language: English_x000D_Power: 40w x 2_x000D_Additional Features: Support Bluetooth, FM Radio Function_x000D_Interface Function Introduction:_x000D_USB, Digital Display, Memory Card Slot, AUX, Volume -, Volume+, Play Pause, Mode Features: 1Home Audio: 2 channel Bluetooth stereo amplifier receiver is very suitable for your karaoke, home theater and sound system. The peak power is 40w x 2 watts, which can easily accommodate a set of speakers and enjoy high quality audio amplification. 2Input and Output Support: The digital amplifier box supports various external signal sources, audio input USB, storage card, and FM radio antenna. With RCA audio output, 2 pairs of speaker output. So you can enjoy karaoke to the fullest. 3Bluetooth 5.0: The sound reinforcement mixing device is equipped with Bluetooth music streaming, and the wireless range is 40 feet/12 meters or more. Compatible with your favorite devices, such as smartphones, tablets, and computers. 4Remote Control: Comes with a mini remote control, which is convenient for you to control the machine from any angle and get rid of the shackles of wires. (Note: Please remove the battery insulation sheet on the remote control to make it work) 5Front Control Panel: This home speaker amplifier home audio Bluetooth receiver has front panel buttons and rotating control center, with digital LED display, easy to operate. In addition, it is equipped with an antenna and remote control for remote audio adjustment. PackageList: 1 x Power Amplifier 1 x Remote Control