Procall Blocker Version 4 Blocks 1000 phone numbers with (8-16) digits. Each CALL BLOCKER UNIT comes with a Manual Instructions, Power Adaptor & Telephone Wire. *Batteries Not Included*. Review last 100 incoming calls on a JUMBO display with blue back light .LCD will display the phone number(upto 16 digit) with date and time of each call. Review last 50 outgoing calls . LCD display brightness can be adjusted.Default setting for the display bright is 2. LED for incoming call indication. Set up Security PIN for modifying the black list. Add/Remove Phone Numbers to the Black List.