High amplification efficiency 85% can directly drive 4 to 8 Ohm small speakers with good sound quality & noise suppression. Unique without LC filter class D digital power board. Can use computer USB power supply directly. Protection mode is current-limiting with thermal shutdown.

• Operating Voltage: 2.5 to 5 VDC
• Connections: Solder connections
• Sound processor: PAM8403
• Dimensions: 0.9" x 0.63" x 0.08" (23 x 16 x 2 mm)