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Crazy and annoying about the robocalls, sales calls?Hate to be interrupted by nuisance and spam calls when working?MCHEETA CT-CID803 CALL BLOCKERS devote to protecting your privacy.Say good bye to all unwanted calls at one touch of the red block button. ❖Warm Notes❖★Caller ID service and a phone line are required for the device to work.★The device will not show the name of the caller. ❖Why Choose Us?❖ ★Slim Body with High Capacity: the small device can block up to 4000 numbers. ★No Extra Battery Required: the device is phone line powered, and parallel set up can be considered if more than 5 devices.★Easy to Set Up: (1)Unplug the phone line from your phone and insert it to the line port of call blocker. (2)Connect the call blocker and your phone with the short cable provided. ★Worldwide Compatibility The phone call blocker is compatible with 99% USA landline providers and landline phone manufacturers.❖Frequently Asked Questions❖ ★Build Your Own Blacklist (1)While the call is active, press the “BLOCK” button. (2)Review the calling list by press the “◀/ ▶” buttons at home page, press the “BLOCK” button. (3)Pick up the phone handset, press “*” TWICE, enter a phone number, and press “#” to block it. (Based on the Phone). ★How to review and delete blocked numbers? Press the “BLOCK” button, then use the “◀/ ▶” buttons. Numbers are stored in numerical order. To delete a blocked number, press the “DELETE” button twice, then back. ★How to get back to factory setting? Pick up phone handset, press “*”, then enter "61806180", press "#" key to exit. Lifetime Warranty is guaranteed, welcome to contact us freely to get help if any issues.