mini speaker,USB/TF mini speaker 1.baby foot ,and good face 2.sound quality 3.factory price as reference 4.accept OEM Product ParameterLoudspeaker Specification 40mm diameter 3w *4 Ω *1Low frequency radiation device (Beryllium)Output power 3WFrequency response 60Hz--20KHzSensitivity 80db±2dbSNR ≥80dBDistortion ≤0.2%USB Specification USB 2.0, compatible USB1.1Power supply mode DV5V USB power ...