Electric tool, and electric tool system

An electric tool, comprising:

• a tightening unit configured to perform a tightening task of tightening a component by a drive force of a drive source;
• a sensor unit configured to perform a measurement processing including measuring at least a tightening torque provided by the tightening unit and obtaining working data relating to a result of measurement;
• a communications unit configured to transmit the working data;
• a storage unit configured to store the working data;
• and
• a tool body which is portable-type and which houses therein or holds the tightening unit, the sensor unit, the communications unit, and the storage unit,
• the electric tool having, as a communications mode for transmitting the working data stored in the storage unit from the communications unit, a first communications mode and a second communications mode,
• the communications unit being configured to,
• in the first communications mode, transmit, during an interval between the tightening tasks, first working data which is part of the working data stored in the storage unit, and
• in the second communications mode, transmit at least second working data after completion of all of the tightening tasks, the second working data being the working data stored in the storage unit except the first working data.