Mine doesn't tell me when it's getting low but I do try to keep an eye on it. And if it's getting low I'll just make sure to only piece until it's gone. If I'm quilting I will change the bobbin at the end of a run, even if it's not out, and then use the little bit left later when I'm piecing. I don't mind it suddenly running out when I'm piecing. I hate when it happens when I'm quilting.