An object of the present invention is to provide a lithium secondary battery which has improved capacity, durability, and the other characteristic as compared with conventional lithium secondary batteries. The probe further comprises an arrangement of electronic circuits responsible for the excitation and detection of the nuclear magnetic resonance signal and at least one coil to expose the fluid sample to the excitation signal and to collect the returned nuclear magnetic resonance signal. The method further includes forming a first contact on the capacitor conductor. The conference call server detects that the message is a conference call set up message on the basis of the header fields of the message, and establishes a conference call.