The AMPLIPOWER 40, from Geemarc, is a very loud amplified telephone that is hearing aid compatible and although designed for people who are deaf and hard of hearing it is a good phone for businesses with loud background noise. With an inductive coupler in the handset a person with a hearing aid or cochlear implant processor that has a telecoil can switch to the T or loop setting. This Amplified Telephone has a user adjustable volume control and a boost button that takes the amplification to 40dB. The volume control can be increased or decreased during a telephone conversation. With the large buttons, ring indicator and speakerphone this phone is also ideal for people with poor vision and limited manual dexterity. If you require a phone with greater amplification there is the Geemarc AMPLIPOWER 50 with volume to 60dB. If less volume is required why not look at the CL100, with adjustable volume to 30dB, part of the Clearsound range of telephones.