A slide rail assembly applied to a rack system for mounting an object to a rack , the slide rail assembly comprising: a first rail ; a second rail movable with respect to the first rail ; and a cable management device for use with the slide rail assembly , comprising: a first tray ; a first cable chain connected to the first tray ; and a second tray , wherein the second tray is connected to the first tray , and one of the first tray and the second tray includes a slot and a mounting member extending through a portion of the slot allowing the second tray to be moved in an extendable and retractable manner so as to move with respect to the first tray and thereby enter a retracted state or an extended state, wherein the first cable chain is detachably connected to the first tray , and wherein the second tray is configured to support the first cable chain while moving with respect to the first tray from the retracted state to the extended state; wherein the first rail is mounted on the rack , the second rail is mounted with the object , the first tray of the cable management device is mounted on one of the first rail and the rack , and the first cable chain of the cable management device is moved in response to the second rail moving with respect to the first rail . a first rail ; a second rail movable with respect to the first rail ; and a cable management device for use with the slide rail assembly , comprising: a first tray ; a first cable chain connected to the first tray ; and a second tray , wherein the second tray is connected to the first tray , and one of the first tray and the second tray includes a slot and a mounting member extending through a portion of the slot allowing the second tray to be moved in an extendable and retractable manner so as to move with respect to the first tray and thereby enter a retracted state or an extended state, wherein the first cable chain is detachably connected to the first tray , and wherein the second tray is configured to support the first cable chain while moving with respect to the first tray from the retracted state to the extended state; wherein the first rail is mounted on the rack , the second rail is mounted with the object , the first tray of the cable management device is mounted on one of the first rail and the rack , and the first cable chain of the cable management device is moved in response to the second rail moving with respect to the first rail . a first tray ; a first cable chain connected to the first tray ; and a second tray , wherein the second tray is connected to the first tray , and one of the first tray and the second tray includes a slot and a mounting member extending through a portion of the slot allowing the second tray to be moved in an extendable and retractable manner so as to move with respect to the first tray and thereby enter a retracted state or an extended state, wherein the first cable chain is detachably connected to the first tray , and wherein the second tray is configured to support the first cable chain while moving with respect to the first tray from the retracted state to the extended state; wherein the first rail is mounted on the rack , the second rail is mounted with the object , the first tray of the cable management device is mounted on one of the first rail and the rack , and the first cable chain of the cable management device is moved in response to the second rail moving with respect to the first rail . <EOS>