The Icom SP-23 speaker matches many Icom receivers and transceivers. It is 8 Ohms and is rated at 2 Watts [4 Watts maximum]. The SP-23 with four separate audio network filters [HPF1 500 Hz, HPF2 250 Hz, LPF1 3000 Hz, LPF2 1000 Hz]. Input A or B may be selected so two radios may share this speaker. There is a speaker on-off switch and a 1/4 headphone jack on the front panel.