This machine is designed for listening to music on home computers, and it is easy to use with portable devices with Bluetooth function. The casing of the whole machine is made of CNC all-aluminum alloy, and the retro-designed warm-light dual-header adds a touch of atmosphere to music listening. The appearance of the whole machine is exquisite and compact, which is convenient for placing on the computer desktop. Actual comparison audition, if you do not need high power output, the sound of this machine is stronger than FM300A! Working method: Class AB Work voltage:AC115V and AC230V optional Quiescent current: 60mA Output Power: 25W+25W/8? , distortion 0.3% Frequency response: 20Hz to 50KHz Dynamic range: >100 dB Machine size: 26082193MM Net weight: 4.1KG. Finished amplifier x 1 not included AC power cord.