Abstract: A method for monitoring whether a number of a rat traps have been activated, where each tap has a moveable part, a fixed part, a switch and a signaling device, such than when the moveable part is moved towards the fixed part then the signaling device transmit a signal to a user's smartphone having a display on which display the user is informed whether a rat has gone into the trap. An opening size between the moveable part and the fixe part is detected indicating whether a rat, a mouse or a false alarm is detected. By the invention a beneficial and accurate way of monitoring the status rat traps are obtained.