A small form-factor pluggable transceiver for being inserted into an electrical connection slot of an electronic apparatus, comprising: a housing including a front end and a rear end opposite the front end, wherein an inner surface of the housing defines an accommodating space; wherein the housing includes a front plate arranged in the front end, an upper cover, and a lower cover fastened to the upper cover, wherein the front plate, the upper cover, and the lower cover are assembled together so as to jointly define the accommodating space, wherein the front plate includes a metallic layer, and wherein the metallic layer includes a ring-shaped shielding structure arranged on an edge thereof, and the upper cover and the lower cover each include a shielding structure (113, 123), wherein the shielding structure of the metallic layer is engaged with the shielding structures (113, 123) of the upper cover and the lower cover; two electrical signal connectors deposed on the front plate, and each having an inserting end and a connecting end opposite the inserting end, wherein the inserting end is arranged outside the front end of the housing, and the connecting end is arranged in the accommodating space; a circuit board fixed to the housing and arranged in the accommodating space; and two flexible assemblies each having an end detachably connected to the circuit board and an opposite end detachably connected to one of the electrical signal connectors corresponding thereto, wherein the SFP transceiver is configured to receive a signal, and the signal travels from each of the two electrical signal connectors to the circuit board through the corresponding flexible assembly, wherein each of the two flexible assemblies, the corresponding electrical signal connector, and the circuit board are configured to be respectively disassembled for being independently tested. a housing including a front end and a rear end opposite the front end, wherein an inner surface of the housing defines an accommodating space; wherein the housing includes a front plate arranged in the front end, an upper cover, and a lower cover fastened to the upper cover, wherein the front plate, the upper cover, and the lower cover are assembled together so as to jointly define the accommodating space, wherein the front plate includes a metallic layer, and wherein the metallic layer includes a ring-shaped shielding structure arranged on an edge thereof, and the upper cover and the lower cover each include a shielding structure (113, 123), wherein the shielding structure of the metallic layer is engaged with the shielding structures (113, 123) of the upper cover and the lower cover; two electrical signal connectors deposed on the front plate, and each having an inserting end and a connecting end opposite the inserting end, wherein the inserting end is arranged outside the front end of the housing, and the connecting end is arranged in the accommodating space; a circuit board fixed to the housing and arranged in the accommodating space; and two flexible assemblies each having an end detachably connected to the circuit board and an opposite end detachably connected to one of the electrical signal connectors corresponding thereto, wherein the SFP transceiver is configured to receive a signal, and the signal travels from each of the two electrical signal connectors to the circuit board through the corresponding flexible assembly, wherein each of the two flexible assemblies, the corresponding electrical signal connector, and the circuit board are configured to be respectively disassembled for being independently tested.