Electric tool and electric tool system

An electric tool comprising:

• a fastening unit configured to perform a fastening operation on a designated member using driving force supplied from a power source;
• a control unit configured to control operations of the fastening unit;
• a sensor unit configured to measure at least fastening torque applied by the fastening unit;
• a communications unit configured to transmit operations data about a result of measurement made by the sensor unit;
• a storage unit;
• and
• a portable tool body housing the fastening unit, the control unit, the sensor unit, the communications unit, and the storage unit,
• the communications unit including:
• a wireless communications unit configured to transmit the operations data by a wireless communication method;
• and a wired communications unit configured to transmit the operations data by a wired communication method,
• the communications unit being configured to transmit the operations data in a communication mode including at least a wireless communication mode and a wired communication mode,
• the wireless communications unit being configured to transmit, by the wireless communication method in the wireless communication mode, at least a part of the operations data about the result of measurement provided by the sensor unit, when the fastening operation has been done for either one round or multiple rounds, and
• the wired communications unit being configured to, while the communications unit is operating in the wired communication mode, transmit, by the wired communication method in the wired communication mode, the operations data stored in the storage unit.