242021-TP2-21F Amplified Big B  

• Manufacturer  Cortelco
• Part#   ITT-2420 
• Amplified Big Button W/ Caller ID, Hearing aid compatible
• Incoming Voice Volume adjustment (18dB to 40dB)
• Incoming Ringer Volume adjustment (Off/Lo/High 95dB)
• Incoming Voice Tone adjustment (frequencies)
• Large LCD display with backlight