The BT Telephone BT4000 Big Button has large buttons making it not only practical for elderly customers but also an aid to sight, hearing and dexterity impaired customers. Fed up with sales calls interrupting you at home? The new BT4000 Big Button brings you unique functionality to block nuisance or unwanted calls. Its call management feature puts you back in control, by enabling you to choose the calls you want to take and those you want to block. Designed in the UK, the BT4000 Big Button offers you a large easy to read display, great sound quality and tons of simple to use features. With the BT4000 Big Button you can choose the type of calls you want to block. For example international and withheld numbers can be blocked, which account for a large proportion of unwanted sales calls. Alternatively if there are specific numbers you want to block, you can block up to 10 numbers from getting through.