... Microphone Speaker (Length 40mm by Thickness 2.8mm, 8 ohm)1, No minimum order requirement;2, Have room to negociate about price ... characters of micro speaker:1, Color: Black, Green, Silver, Red...;2, Paper, Plastic, Metal;3, (Nonpress) Cone: with Surface (half) ... follows:1, Dimension (mm): various alternative sizes;2, Impedance (ohm): 8~35 ohm;3, Sensitivity(db): 85~100db;4, Frequency Range (Hz ...