4" speaker with 100 V line transformer of 6-3 W integrated. Frequency response: 90 to 15,000 Hz, sensitivity: 91 dB (1 W, 1 m, 1 kHz), maximum SPL: 99 dB (1 m, 1 kHz). Dimensions: 106 x 106 x 60 mm. Weight: 250 gr.