Amplicomms BigTel 48Plus CG2 Big Button Corded Phone | BlackAmplicomms BigTel 48Plus has unique sound performances and can produce a very high handset volume. For even louder conversations, during a call, you can press the dedicated audio boost key to increase the volume of the receiver by up to 40dB. It is ideal for people with moderate to stronger hearing loss. In addition, thanks to the powerful ringers adjustable to up to 90dB, and the extra large bright call indicator, you are less likely to miss a call.