Important Information Material:Electronic Components Package Size: L: 2cm/0.79", W: 1.5cm/0.59"(Approx.) Overview: You can expand the sound with the help of this amplifier board and it is versatile and can be applied to Bluetooth-compatible speakers, amplifiers, video players, etc. What this digital audio amplifier board offers is a mono stereo sound quality that amplifies sound effects and amplifies digital audio signals, and it is low power and safe to use. It is constructed of electronic components material. The length of this product is 2cm and the width is 1.5cm. This audio amplifier is suitable for passive speakers, loudspeakers, and so on. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Specifications: Current: 5V Recommended for: 3W 4R Speakers Features: Package Content: 1 x Power Amplifier