A wristwatch , comprising a housing , a bottom cover , and a top cover , the housing made of a metal material, the top cover made of a non-metal material, the wristwatch further comprising: a short distance communication module disposed inside the housing , configured to carry out short distance communication with an external device, the short distance communication module comprising: a coil configured to transmit electromagnetic signals; a security chip configured to interpret the electromagnetic signals transmitted by the coil to carry out the short distance communication with the external device; an amplifier disposed between the coil and the security chip , configured to increase magnitude of the electromagnetic signals transmitted by the coil to extend signal sensing distance, characterized in that the short distance communication module further comprises: a transparent conductive film disposed on the top cover , configured to receive a user operation and generate a detecting signal correspondingly, wherein the transparent conductive film comprises a plurality of conductive wires that are interlaced with each other to construct a plurality of conductive units , and the detecting signal corresponds to an integral effect of electrical signal changes of all of the conductive units ; and a controller coupled to the transparent conductive film and the amplifier , configured to receive the detecting signal and determine a gain of the amplifier according to the detecting signal, wherein based on the gain determined by the controller , the amplifier adjusts the magnitude of the electromagnetic signals transmitted by the coil to adjust the signal sensing distance. a coil configured to transmit electromagnetic signals; a security chip configured to interpret the electromagnetic signals transmitted by the coil to carry out the short distance communication with the external device; an amplifier disposed between the coil and the security chip , configured to increase magnitude of the electromagnetic signals transmitted by the coil to extend signal sensing distance, characterized in that the short distance communication module further comprises: a transparent conductive film disposed on the top cover , configured to receive a user operation and generate a detecting signal correspondingly, wherein the transparent conductive film comprises a plurality of conductive wires that are interlaced with each other to construct a plurality of conductive units , and the detecting signal corresponds to an integral effect of electrical signal changes of all of the conductive units ; and a controller coupled to the transparent conductive film and the amplifier , configured to receive the detecting signal and determine a gain of the amplifier according to the detecting signal, wherein based on the gain determined by the controller , the amplifier adjusts the magnitude of the electromagnetic signals transmitted by the coil to adjust the signal sensing distance. a transparent conductive film disposed on the top cover , configured to receive a user operation and generate a detecting signal correspondingly, wherein the transparent conductive film comprises a plurality of conductive wires that are interlaced with each other to construct a plurality of conductive units , and the detecting signal corresponds to an integral effect of electrical signal changes of all of the conductive units ; and a controller coupled to the transparent conductive film and the amplifier , configured to receive the detecting signal and determine a gain of the amplifier according to the detecting signal, wherein based on the gain determined by the controller , the amplifier adjusts the magnitude of the electromagnetic signals transmitted by the coil to adjust the signal sensing distance. <EOS>