An electric tool (100) including a first digital control unit, that generates a first digital data signal (108) to be transmitted. The first digital data signal (108) includes operational data of the electric tool (100). The electric tool (100) further includes an interface (106) which further includes at least one light-emitting diode (LED_t) (112) configured to transmit the first digital data signal (108). The at least one light-emitting diode (LED_t) (112) is connected with the first digital control unit in a forward direction, and configured to transmit the first digital data signal (108). The electric tool (100) characterized in that, the interface further includes at least one light-emitting diode (LED_r) (114) configured to receive a second digital data signal (110). The electric tool (100) characterized in that, a second digital control unit which includes a detection circuit for detection of the second digital data signal (110). The at least one light-emitting diode (LED_r) (114) is connected with the second digital control unit in a forward direction.