Package includes: 1 piece of amplifier board The mono power amplifier board chip has TDA7293/7294, which will be sent randomly. What you received is in loose parts, need to assemble it by yourself. The product will be upgraded constantly, the appearance and color may be changed, please don't mind. And take a consideration before place the order if you have request for color or appearance. Features 1. This circuit is an official standard circuit, which is stable and reliable. 2. The filter adopts large electrolysis with a withstand voltage of 50V and a capacity of 2200uf. 3. Supply voltage: double 12-36V ring cow, double 32V ring cow is recommended 4. Output power: 85W * 1 rated power without distortion, peak power 100W 5. Can easily push speakers above 100W, speaker impedance: 4-8 ohms 6.PCB size: 50*50mm Use note: Must use 3 wire transformer, double 12-32 can be used, you must paste the heat sink yourself Neither direct current nor batteries! 1. This is a DIY product, the success or failure depends on personal level, the power amplifier board parts need to be welded by yourself: 2. There is no circuit diagram for this product (clear component marks on the PCB board), nor any technical consultation. 3. The kit parts are tested and shipped. Free repairs are not provided.Thank you for your understanding. 4.Due to the different purchase batches of components and the need for product improvement, some parts of the product may not be the same as those in the picture, but we guarantee the same or better quality.