Built-in high-speed switching power supply and 2.1-channel core power amplifier board, which can be connected to audio sources such as mobile phones, TVs, computers, and Blu-ray CDs. Connect a pair of stereo speakers and a passive subwoofer, the sound quality is very HiFi, the low frequency is strong, the maximum output of the subwoofer is up to 600W, and the maximum output of the left and right channels is 300W+300W. The Bluetooth output is independently decoded PCM5102A. Use 2 TPA3255 chips. NE5532 operational amplifier, Qualcomm QCC3034 Bluetooth receiver module. All aluminum silver case. 1 × Finished power amplifier. We are dedicated to offer the best audio-visual products at the lowest price to our customers. Bringing great products and customer service, and thus help enriching our customers’ lives is our ultimate goal. (Except some countries and APO/FPO). You should check the product’s appearance safety before to sign receipt. Else we can’t seek compensation with the couriers. Since online shopping uncertainty, so thank u very much for choosing&trusting us. Our service is ready to help u any time, your feedback is extremely important to us. If you are satisfied, please leave 5 stars positive feedbacks, It’s very honored for us to achieve generous authentic assessments, thx!