The Plantronics Clarity EHA-40, a compact In-line amplifier, is compatible with most home or office telephones, and gives up to 40db amplification, ideal for those experiencing moderate deafness. The tone can be adjusted to suit personal tastes, connecting easily between the telephone handset and base. The product has an integrated boost button for extra loud sound up to 40dB when needed. For safety reasons the EHA40 will reset itself to the standard sound level when the integrated boost button is released. Important note:- The Clarity EHA-40 provides amplification and is popular with many people who suffer a minor hearing impairment. Unfortunately it is not suitable for all users. If you have a serious loss of hearing, we suggest you visit a hearing specialist who may be able to offer a product that matches your exact requirement. Like most suppliers, we are unable to provide a 'try before you buy scheme'. > > EHA-40 User Guide < < | 
