Hello Direct Noise Filter (RJ-9 Handset Jack)

Hello Direct Noise Filter (RJ-9 Handset Jack), Noise Filter removes electromagnetic interference (EMI) up to 30 decibels and improves transmission quality up to 9 times! 1 and 2 line versions (RJ-11 RJ-14). Use it on corded phones modems faxes and answering machines too. It meets all FCC regulations. Install it between the wallplate and your phone cord.Before You OrderNot recommended for cordless phones.