The CPR Shield Call Blocker is pre-loaded with 2000 numbers which are deemed as known unwanted callers. Companies which are selling by phone, using overseas call centers and automated sales lists are all pre-blocked which will minimize the sales calls you receive almost immediately. Compatible will all major UK landline providers, including BT, Virgin, Sky, EE, Talk Talk, Plusnet, Vodafone etc. Quick & simple to connect. No mains power required (uses the power from your existing phone line). New and unused. Only opened to check and verify contents.
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