connected to the limiting plate 62 in an initial state the support plate 90 can be coupled to the limiting plate 62 by the clasp 94 in use the mobile phone can be received in the receiving portion 227 when the earphone 200 is not in use the two earphone jack 260 can be clamped by the first clamping portion 82 the cable 280 can be wound to the first linear portion 42 and the second linear portion 44 and the two ear plugs 230 can be received in the earphone receiving holes 2253 the support plate 90 can be pulled by user thus the clasp 94 can be taken out from the locking groove 425 and the support plate 90 can rotate a predetermined angle relative to the limiting plate 62 fig7 illustrates that the support plate 90 can be inclined to the limiting plate 62 thus the casing body 20 with the portable electronic device inside can be supported by the support plate 90 and the protective cover 100 can be placed on a desk the limiting plate 62 the winding portion 40 and the casing body 20 of the protective cover 100 can cooperatively form a ring shaped accommodating space 70 configured for receiving the cable 280 as the support plate.