Accessory handset features an extra-large display with high-contrast black text to easily read your incoming Caller ID or call history records. Lighted handset keypad allows easy dialing in low-light conditions. Simulated full-duplex speakerphone increases participation by allowing both ends to speak & be heard for conversations that are more true to life. Eco-mode, power-conserving technology allows the system to use less energy to provide the best battery life. Call block directory allows you to save up to 20 names & numbers to stop unwanted calls from ringing through (Caller ID subscription required). Programmable design holds up to 50 names & associated phone numbers to quickly call & access your frequently dialed numbers. Handset also includes voicemail waiting indicator, last 10-number redial, mute, any key answer & more.