Nrs Healthcare Geemarc Big Button Hearing Aid Compatible Telephone Easy to use, this is a fantastic telephone for those who are visually impaired and/or hard of hearing. The Geemarc CL100 telephone has big, easy to see buttons, making it suitable for the visually impaired. It also has a receiver volume of up to 30db (3 to 4 times louder than a normal telephone), and a ringing volume of up to 85db, with a large visual ring indicator too. It is also hearing aid compatible for users with a T setting.There is a pop out phone number sheet beneath the telephone on the right hand side of the telephone. There are three coloured emergency quick dial buttons at the top of the telephone in green, red and blue. Additionally, there are 9 quick dial memory buttons that can be programmed for one-touch dialling down the right hand side of the telephone.This telephone does not require a power supply to achieve the 30db amplification and can, therefore, be used where there are no power points or plug so