1. Latest upgrades: As an upgrade to the AK45, this HiFi amplifier can output 50Wx2 rated power, up to 500Wx2. It can easily control a variety of passive speakers with 48 inches. It supports DC 12V/5A or AC 220240V power supply. 2. HIFI stereo effect: This amplifier features a powerful audio processing chip, supports treble and bass adjustment, has a low distortion rate, strong antiinterference ability, and low noise, delivering an immersive audio experience. 3. Multiple inputs: Equipped with Bluetooth 5.0, this HiFi amplifier ensures efficient and stable connectivity. It supports USB/SD/AUX/RCA/MIC inputs and FM radio, and is compatible with CD, DVD, TV, PC, tablets, phones, MP3, projectors, etc. It is ideal for indoor/outdoor use, parties, and teaching. 4. Compact and portable: Despite its small size, this mini amplifier delivers power and is compatible with bookshelf, cellar, and outdoor speakers. It saves space and allows you to enjoy music anytime, anywhere. It also supports loop playback.