The RH 100 Remote Horn will alert you by sounding a loud siren with an adjustable volume (up to 113dB) and adjustable tone (from 400-2500 Hz). It is ideal for hard of hearing family members. The RH 100 plugs directly into your wall outlet. The RH100 can be mixed with all Sonic Alert remote receivers and must be used with a Sonic Alert signaler. 5 year warranty.