Clarity Professional XL40D Digital Extra Loud Big Button Speakerphone: * Amplifies incoming sound to 50dB and outgoing speech to 15dB * Clarity Power technology for loud and clear conversations * 4 tone settings for a customized listening experience * Hearing aid and T-Coil compatible with TIA-1083 compliance * Extra large high-contrast buttons for optimal visibility and easy dialing * Full duplex speakerphone * Super bright incoming call ring flasher * 12 memory dialing buttons * Desk/wall mountable * Loud ringer (90dB) with adjustable tones * Direct connection to assistive listening devices or headset (2.5mm or 3.5mm) * Includes AC adapter and wall mount bracket