Device for machine tool

A device for a machine tool, detachable from an attachment part of the machine tool, comprising:

• an imaging unit to generate image or video data;
• a first communication unit to transmit the data generated by the imaging unit to an information processing device;
• a first control unit to activate and control the first communication unit;
• a power receiving unit to receive power supplied from outside and transmit the power to the first control unit;
• a second communication unit capable of constantly communicating with the information processing device;
• a battery to supply power to the second communication unit;
• and
• a second control unit to supply power to the first control unit to activate the first control unit when the second communication unit has received an activation command from the information processing device
• wherein the second communication unit receives the activation command before the device for a machine tool is attached to the attachment part, and activates the first control unit to establish communication between the first communication unit and the information processing device before the device for a machine tool is attached to the attachment part.