On my Telebee's I never hook up the yellow wire, by leaving it unhooked the gyro is always in HH mode, and in my experiences the Telebee just seems to work better when the yellow wire is unplugged, but again thats just my experience with them, I just took a Telebee off my ES600 the other day, I have been flying that with the yellow wire unplugged for a little over a year before upgrading to a better gyro.