This product does not contain a power supply. The power supply purchase link is as follows. You can also buy a laptop power supply outside. The power supply range is above 18-30V 4A, and the power interface should meet the outer diameter of 5.5MM and the inner diameter of 2.5MM.Bluetooth version 5.0, input is 3.5 headphone jackNon-Bluetooth version. Input is Lotus RCA socket A very good digital power amplifier with good driving power, low distortion, very good level of detail, and natural sound. Suitable for use with middle and high-end speakers The Bluetooth 5.0 version of the program is the current very high-end QCC3008 chip, supporting APTX, APTX protocol makes Bluetooth close to CD sound quality, truly lossless.The guardian angel of Bluetooth-aptX® technology is born It re-encodes and decodes the audio to be transmitted, significantly reducing the bit rate, without affecting the sound quality, and without the delay of transmission, making the Bluetooth stereo listening experience a revolutionary leap. Therefore, with aptX, you can enjoy pure wireless audio with CD-level sound quality anytime, anywhere.Note that the voltage 220V stated in the following parameters under 1 is the input voltage of the external power adapter. The machine itself stillIt uses a DC power supply.The machine’s own power supply ranges from DC 18V to DC 32V. The higher the input voltage, the greater the input current and the greater the output power. It is recommended to match the range DC18-DV28VFrequency range: 20HZ- -30KHZ (+/- 3dB)Signal to noise ratio: 95dBRated power: 150W+150W (4 ohm measurement)Impedance range: 4 to 8 ohmsHarmonic distortion: less than 0.05% 1KHZ.1WInput port: RCA lotus terminalOperating voltage: DC 18-30VAccessories: power supply needs to be purchased separatelySize: width 90MM height 35MM depth 108MMWeight: about 400 grams