Feature:1. Automatic System: /DTMF Call information is automatically identified and displayed. Very convenient to use.2. Superior Performance: Telephone line tester has maximum 8 bit 57 group 12 bit 44 group. Convenient and practical/3. Number Display: Telephone butt test tester has DTMF maximum 8 bit group 65 12bit group 49.4. Multifunction: This lineman tool cable set has last group dial number function.5. Time Display: The telephone tester has real time date and time display. Convenient to use.6. Practical tot Use: When there is a problem with the telephone line, the staff can check the line with a machine.Specification:Item Type:TelephoneLineTesterMaterial: ABSModel: S-4Colour: Dark GreyFunctions: Call, Caller ID, Line DetectionPackage List:1 x Telephone1 x Tieline1 x DescriptionNote:Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.How to use:PlugandPlaySuperior Performance: Features FSK maximum 8 bit 57 group and 12 bit 44 group for reliable testingNumber Display: Equipped with DTMF maximum 8 bit group 65 and 12bit group 49 for clear identificationMultifunction: Includes last group dial number function for enhanced usabilityTime Display: Displays realtime date and time for convenience during testingPractical Use: Ideal for troubleshooting telephone line issues efficiently