A. Main Types: Flexible Type, Normal Single Wire Type, Ear-Hang Type, Neck-Hang Type, and FM radio Series. B. Normal Speaker Specification: Dia10mm, Dia13mm, Dia15mm, Dia16mm …… C. Sensitivity of Normal Speaker: 100dB-110dB 1 KHZ D. Impedance of Normal Speakers: 32ohm ± 15% E. Normal Input Power: 2MW – 20MW