The A938 Bluetooth decoding ear amplifier uses ES9038Q2M decoding chip with good details, large dynamics and positive sound balance. The whole machine uses advanced parts and the potentiometer is ALPS. machine quality , stable work, excellent sound quality. The internal power supply voltage of A938 is 12V, and advanced audio capacitor is used for filtering to the sound is delicate and transparent. The ear amplifier part uses the TPA6120A2 high-performance ear amplifier chip, the output current is as high as 700MA, and the distortion is very low, coupled with the high voltage power supply, the thrust is huge, and there is no pressure to deal with the large headphones with high impedance. A938 is positioned as a high-end Bluetooth receiver and decoder. It uses the QCC5125 advanced Bluetooth module, Bluetooth 5.1 version, supports the LDAC protocol, and has a transmission bit rate of up to 24BIT96KHZ, achieving lossless transmission. When connected to Bluetooth, it is an excellent , which is convenient and fast, and the sound quality is comparable to that of traditional high-end CD players. The main function of the A938 is the integration of decoding ear and amplifier, and its decoding ability and ear amplifier circuit are repeatedly adjusted Using Bluetooth connection, in the face of its powerful quality and tuning, even ordinary cheap headphones can show good results, the sound field is wide, rich in details, and will not feel empty. The overall listening sense is very , the headphone port thrust is huge, the dynamic is , the three-frequency balance is excellent, there is no short board, and the tuning is very high. Instructions 1. A938 uses a single voltage of DC12V for power supply. 2. There is an input signal indicator light on the front panel. The light on indicates the input channel. 3. The output volume of the headphone port will be relatively loud. Please check whether the volume knob is turned down before inserting the headphones. Colour:Black-Gray Material:PCB Package Contents: 1 * Bluetooth Decoder 1 * Antenna Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.