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 or DTMF dual system.1500 numbers memories for blacklist.Reviewing and deleting of numbers in blacklist.Blcklists and whitelists of switchable.Automatic recognization of Tone or Pluse model.LCD display: Date, Time and Week.Reviwing of incoming and outgoing calls by UP or DOWN.5 levels of LCD brightness adjustable.Specifications:Type: Caller ID BlockerModel: CT-CID803Material: ABSColor: BlackLCD Display: Back lightKeys: SET, OUT, BLACKLIST, REMOVE, UP or DOWNProduct size: Approx.10 8.6 4.4cm or 3.9 3.2 1.7in Product weight: Approx.87g or 3.1ozPackage size: Approx.10.2 9.5 5cm or 4 3.7 2inPackage weight: Approx.124g or 4.4ozPackage List:1 Caller ID Blocker1 Network Cable1 User Manual (English) Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store