Visaton 2901.
SPEAKER, MINIATURE, K50, 8OHM; Transducer Function:Speaker; Power Rating RMS:500mW; Impedance:8ohm; Sensitivity (dB):83dB; Resonant Frequency:400Hz; Frequency Response Min:250Hz; Frequency Response Max:10000Hz; Product Range:-; SVHC:No SVHC (15-Jan-2018); External Depth:19.2mm; External Diameter:50mm; External Height:17mm; Frequency:350Hz; Power Rating:250mW; Sound Level Distance:1m; Sound Level SPL:80dB; Throat Diameter:45mm; Weight:50g