Features: 1.Small digital power amplifier module. 2.2 *3W - Output 3W+3W for high fidelity sound quality. 3.This module is made of high-quality material. 4.Strong and durable to use, ensures a long service life. 5.2Pcs per set. specification:Note: 1. Please ensure that the power supply voltage does not exceed 5.5V, please do not reverse the polarity of ''+'' and ''-'', otherwise the board will be burned out. 2. Please allow slight error due to manual measurement. Thanks for your kind understanding. Small digital power amplifier module. 2 *3W - Output 3W+3W for high fidelity sound quality. This module is made of high-quality material. Strong and durable to use, ensures a long service life. 2Pcs per set. : Type: PAM8403 Audio Amplifier Module Working voltage: 2.5V-5.5V Maximum output power: 3W x 2 (5V4) Length: Approx. 29 mm Width: Approx. 20mm The total height after installation: approximately 16mm Weight: Approx. 9.3g Package list: 2 x PAM8403 Audio Amplifier Modules Note: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.