Unbranded Computer Accessories Gray TM1637 sku-8777602584

This Unbranded Gray item, sku-8777602584, is listed under Computer Accessories. The title identifies a TM1637 4-Bits 0.36 Inch 7-Segment red anode clock tube LED display module with a 4 serial driver board and a DTMF dual system. The description lists tone dialing, on and hangup controls, a dedicated hangup button and last-number redial. It says a lineman can use these functions to check a telephone line for faults.