This device is a kind of powerful multi-function call blocker which can block numbers added to blacklist, with the Pro call Blocker, your world finally get quiet.Features:Block unwanted callers.FSK/DTMF dual system.1500 numbers memories for blacklist.Reviewing and deleting of numbers in blacklist.Blcklists & whitelists of switchable.Automatic recognization of Tone/Pluse model.LCD display: Date, Time and Week.Reviwing of incoming and outgoing calls by UP/DOWN.5 levels of LCD brightness adjustable.Specifications:Type: Caller ID BlockerModel: CT-CID803Material: ABSColor: BlackLCD Display: Back lightKeys: SET, OUT, BLACKLIST, REMOVE, UP / DOWNProduct size: Approx.10 8.6 4.4cm / 3.9 3.2 1.7in Product weight: Approx.87g / 3.1ozPackage size: Approx.10.2 9.5 5cm / 4 3.7 2inPackage weight: Approx.124g / 4.4ozPackage List:1 Caller ID Blocker1 Network Cable1 User Manual (English)