Try connevans - www.connevans.co.uk. This english company provides products for the hard of hearing and the deaf. They have a telephone with up to 80dB output - plus it's got a volume control so the user can dictate the output volume.
NOTICE: The information provided on this site is not a substitute for professional medical advice,
diagnosis, or treatment. Never delay or disregard seeking professional medical advice from your
physician or other qualified health provider because of something you have read on Wellsphere.
If you have a medical emergency, call your doctor or 911 immediately.