Electromechanical lock comprising: - an operating cylinder extending between a first end and an opposite second end along a longitudinal direction (X-X); - an inner knob rotatably connected to the operating cylinder at the first end ; - an outer knob rotatably connected to the operating cylinder at the second end ; wherein the operating cylinder is configured to switch between a locking position, wherein the outer knob rotates idle, and an unlocking position, wherein the rotation of the outer knob results in the operation of the operating cylinder ; wherein the inner knob comprises: - an actuator powered by a battery and a control unit in signal communication with the actuator and with the battery , said actuator being configured to switch the operating cylinder from the locking position to the unlocking position upon receiving an unlocking signal from the control unit , the control unit being configured to send the unlocking signal to the actuator upon receiving a wireless opening signal from an outer device; - a detection device in signal communication with the control unit , said detection device being connected to the outer knob by means of rotation transmission means placed in the operating cylinder , said detection device being configured to detect rotations of the outer knob and to send a detection signal to the control unit for each rotation of the outer knob , the control unit being configured to process detection signals from the detection device and to send wireless output signals to an outer device; characterized in that: - the wireless output signal sent by the control unit to an outer device is an occurred access signal when the operating cylinder is in the unlocking position and the control unit receives at least one detection signal from the detection device . - an operating cylinder extending between a first end and an opposite second end along a longitudinal direction (X-X); - an inner knob rotatably connected to the operating cylinder at the first end ; - an outer knob rotatably connected to the operating cylinder at the second end ; wherein the operating cylinder is configured to switch between a locking position, wherein the outer knob rotates idle, and an unlocking position, wherein the rotation of the outer knob results in the operation of the operating cylinder ; - an actuator powered by a battery and a control unit in signal communication with the actuator and with the battery , said actuator being configured to switch the operating cylinder from the locking position to the unlocking position upon receiving an unlocking signal from the control unit , the control unit being configured to send the unlocking signal to the actuator upon receiving a wireless opening signal from an outer device; - a detection device in signal communication with the control unit , said detection device being connected to the outer knob by means of rotation transmission means placed in the operating cylinder , said detection device being configured to detect rotations of the outer knob and to send a detection signal to the control unit for each rotation of the outer knob , the control unit being configured to process detection signals from the detection device and to send wireless output signals to an outer device; - the wireless output signal sent by the control unit to an outer device is an occurred access signal when the operating cylinder is in the unlocking position and the control unit receives at least one detection signal from the detection device . <EOS>