[Features] ●It is a factory wireless device that can be connected to machines and various sensors, and can notify andons, buzzers, signal lights, and portable receivers in remote locations. ●Because it is wireless, cable laying is unnecessary. ●The radio wave reachable distance is about 3000m (line-of-sight distance). ●There is no interference because it can be identified by the ID number of the transmitter. ● Portable type. ●Notify with light, vibration, and buzzer when receiving.