The clock is a receiver (message receiver) that informs about a call. It can be used in cafes to inform the service staff about the order made, customers who want to pay, in nursing or medical institutions and similar situations. Operating distance 50-200m in an open place. In rooms, depending on obstacles (walls), the distance may be smaller. Operating principle: pressing the pager button triggers the bell, vibration or screen indication, which informs the service staff. These clocks-receivers are compatible with our offered pagers-transmitters.