A rotatable support comprising a rotary member, a support member, an upper wire, a lower wire, and a mounting base, the support member being held in the mounting base, the rotary member being inserted into the mounting base and supported by the support member, and wherein the rotary member is relative is rotatable to the support member, wherein the upper wire is received in the rotary member and provided with an upper connector, the lower wire is recessed in the support member and provided with a lower connector, wherein either the support member or the rotary member provided with a conductive recess with the other of the upper connector or lower connector provided with a conductive pin which is rotatably inserted into the conductive recess.
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