MCHEETA Powerful Land line Phone Call Blocker,16000 digits numberes blacklist capacity,Blocking Telemarketers,Robocalls,Junk Faxes Block up to 1,500 phone numbers and 10 area codes Line powered - requires no batteries or external power. Compatible with phone lines from all main landline and VoIP service providers. Easy to setup and Use One (1) year warranty & support (phone, email, chat)