disassembled telephone. red led diodes and gray buttons

16x9 background beige black blur board button buttons circuit closeup communication component components design detail digital diode disassembled dismantled electrical electronic electronics emitting engineering environment focus gray hardware industry information internet jumper key keyboard keypad keys led light maintenance metal microswitch microswitches nobody nopeople off open over part phone plastic protocol push pushbutton pushbuttons red repair resistor round selective semiconductor semiconductors service supply switch switches technical technology telecommunications telephone telephoning voice voip waste wire yellow