【TPA3251D2 chip】The TPA3251D2 chip adopts the original TI TPA3251D2 HiFi amplifier chip and PurePath technology to achieve ultra-high definition, extremely low distortion, and high fidelity audio quality. Supports a wide voltage input range of 12 to 36V DC, enabling flexible and powerful performance. 【Versatile Audio Input Options】Supports multiple audio input modes, including Bluetooth, USB, and AUX, with Bluetooth 5.2 technology for seamless connectivity. Bluetooth audio supports AAC and SBC codecs, and the USB mode supports decoding of WAV, FLAC, APE, and MP3 formats, catering to a wide range of audio preferences. 【High power digital amplifier dedicated inductor】Utilizes dedicated digital amplifier inductors for high power, low loss, and minimal heat generation, alongside four low-loss metal film capacitors and eight high-capacity black gold capacitors for superior electrical performance and stability. 【High precision, low-noise operational amplifier】Equipped with four TI NE5532 operational amplifiers, it is renowned for its ultra-low noises level and pure sound reproduction. The operational amplifier is installed in a gold-plated socket, which has excellent conductivity and high reliability, and is compatible with JRC5532DD, making it easy to replace the preamplifier. 7 * 24 Hours After-sales Service: Paying Attention To Customer Experience And Satisfying Customers Is Our Service Tenet. If You Have Any Questions About The Product, or The Product Has Quality Problems, Please Contact Us At Any Time, We Will Give You A Satisfactory Answer. ① What is the TPA3116D2 chip? TPA3116D2 is a Class D power amplifier IC launched by TI, with very high index parameters. The highest modulation frequency can reach 1.2MHZ, and the high-power output distortion is less than 0.1% ② I hate reading the manual? Please be assured that you do not read the manual! We have added a variety of interface logos on the cool black shell, so that you can see at a glance, even if you do not need a manual, you can connect it correctly. ③ How many signal input methods does it have? Bluetooth and AUX input methods! When these two input methods input signals at the same time, the Bluetooth input method is the priority input method. If you want to use AUX, please disconnect the Bluetooth connection. ④ Is it durable? This is beyond doubt! This amp board has 4 kinds of protection mechanisms: overvoltage protection, undervoltage protection, overheat protection, short circuit protection, which means it is not easy to be damaged! ⑤ Warm reminder: The power switch on the board is a standby switch. After the switch is turned off, the machine is in a low-power standby state. To completely turn off the power or unplug it for a long time, you can unplug the DC plug on the machine. Properly increasing the voltage or reducing the speaker impedance can effectively increase the output power. ⑥ Packing: ZK-1002T Power Amplifier Board * 1 Protective Shell * 1 Set Screwdriver * 1 Knob * 3 7 * 24 hours after-sales service: Paying attention to customer experience and satisfying customers is our service tenet. If you have any questions about the product, or the product has quality problems, please contact us at any time, we will give you a satisfactory answer.