Red eyes make the cutest noises! they aren't loud at all! They do a chirp and a chatter noise, it sounds a bit like a giggle. Love hearing them every night. Had these in my bedroom for years and was never woken up by them. My white's however and my milk frogs, omg the milks they are the WORST, I had to switch bedrooms for a couple of weeks until they stopped at night. Have yet to hear my bicolors yet, i'm hoping they aren't louder than my white's!