The invention relates to an autonomous lawn mower comprising a control unit in electrical connection with electrical connection means, and at least one replaceable part. The electrical connection means is located such that connection and disconnection of the electrical connection means and its counterpart of the replaceable part can be performed when replacing the replaceable part. The module for such autonomous lawn mower can replace the replaceable part of the lawn mower and comprises a signal generation unit and a counterpart for the electrical connection means of the lawn mower for transmitting electrical signals to a control unit of the autonomous lawn mower. The autonomous lawn mower forms an autonomous lawn mower system together with the module.
