A multi-functional data storage and transmitting and connecting device for an electronic device, includes a data transfer cable having a predetermined length, at least a first and a second connector provided at two ends of the data transfer cable respectively and a coupling element. The coupling element includes a plurality of connector sockets adapted for fittedly and detachably receiving the connectors so as to detachably couple the connectors into a handy structure, a control circuitry received in the coupling element, and a hanging device. The control circuitry includes an integrated circuit chipset, a rechargeable battery provided within the coupling element for recharging the electronic device, a call receiving circuitry electrically connected with the integrated circuit chipset, a speakerphone electrically connected with said call receiving circuitry, an amplifier adapted for amplifying audio signal, and a wireless transceiver electrically connected with the integrated circuit chipset for wirelessly receiving and transmitting signal.