The VTech ES2001 DECT Cordless Telephone is designed for home use and features a Nuisance Call Blocker, long range, and Caller ID with 20 contact memory. You can place the two handsets in convenient locations around your home. The Call Blocker function allows you to block unwanted and unknown numbers and create a blacklist of up to 100 numbers. Save your most important contacts in the 100-entry phonebook for quick dialing. The Caller ID feature lets you save up to 20 contacts, displaying the caller's name and number on the screen. The backlit keypad and LCD screen ensure ease of use, even in low light conditions. For Caller ID and nuisance call blocking features to work, you must subscribe to a Caller Display service from your network provider, which may incur charges. This phone also includes a Volume Booster to amplify incoming sounds for clearer and louder voice, making it ideal for users with hearing impairments. Enjoy up to 18 hours of talk time and 250 hours of standby time. The 3-way conference call feature allows for multiple users to participate in a conversation simultaneously with handset call transfer and intercom. Additional features include Caller ID/Call Waiting (20 Records), Alarm, Mute, 10 Last Number Redial, 100 Name & Number phonebook, Handsfree Speakerphone, 3 Speed Dial numbers, and ECO mode.