5.8 cm (2.3") broadband speaker with diaphragm made of coated paper, rubber surround, square metal basket with 4 mounting holes and rubber seal. Flat plug with 4.8 x 0.5 mm (+) and 2.8 x 0.5 mm (-). Very linear and further frequency response at low resonance frequency enables universal use, also for Hi-Fi applications.This text is machine translated.