Feature: 1. [4 Channel] Compact and lightweight amplifier, using imported 4 channel chip, scientific and humane acoustic principle design, suitable for 2 to 4 speaker has not bad sound quality. Premium aluminum alloy shell, sturdy and durable. 2. [Diversified Functions] BT 5.0 amplifier, with coaxial input, optical input, shocking high power, HiFi sound quality, treble and bass adjustment, U disk, Memory Card (not included) playback and other functions. 3. [Connectivity] The amplifier uses the latest BT version 5.0, providing a 30ft operating range. It can be connected to your music streaming device using BT, RCA sound cable. Also supports USB port, Memory Card (not included) port. 4. [Optical Coaxial Transmission] BT amplifier provides lossless SPDIF super premium, HiFi optical transmission. With a high capacity transformer and no more than 0.2 percent harmonic distortion, it provides clear, distortion free sound. 5. [Multi Application] Receiver amplifier supports multi sound device connection, compatible with phones, TVs, computers and other sound devices, lossless sound output, ideal for home theaters, audition rooms, HiFi, DIY and small offices. Specification: Item Type: BT Amplifier Material: Aluminum Alloy Model: X4 Color: Black Remote Control Battery Type: Built in 160mAh CR2025 Button Battery (Included) Output Channel: 4 Channels (2 Stereo and 2CH Subwoofer) Frequency Response: 20Hz-20KHz Output Power: 60W x 4 Distortion Rate: <0.2% SNR: >80dB Load Impedance: 2-8Ω BT Version: 5.0 Applicable Devices: Support Multiple Sound Devices Connection, Support Cell Phone, TV, Computer and Other Sound Devices. Package List: 1 x BT Amplifier1 x Sound Cable1 x Adapter1 x Power Cord1 x Receiving Antenna1 x Remote Control1 x Manual