Check the listing for details. 20PC PAM8403 Mini 2 Channel Stereo 3W Class D Audio Power amplifier Module Board. Condition: New. Listed at 12.98 USD. Features: Can use the computer USB port, USB power bank or a mobile phone charger to supply the 5V support power Battery power can also be used High efficiency: 90% Can provide 3W (left channel) + 3W (right channel) output power into a 4Ω speak load and 5V power supply CMOS class D amplifier design for high efficiency and low cost Noise canceling circuit built into the amplifier board Power on / off without poppoing noise Module has short-circuit current protection, under-voltage lockout and over-temperature protection (shuts down at an internal temperature of 140C +/- 15C Specifications: Operating voltage: 2.5V-5.5V Speaker Load: 4-8 Ohms Size: 21 x 18 x 3.4 mm (L x W x H) This module has a floating output, therefore left and right channel "negative" connections should not be connected together. The module is designed for driving speakers, it will not work with headphones, which usually share a common ground between the two channels. Package Contents: 20x (20 pieces) PAM8403 Class D Stereo Audio Power Amplifier Module On May 23, 2023 at 19:32:06 PDT, seller added the following information: