This circuit is designed to indicate the level of water in a tank. As the water level rises, more LEDs will light up to show the increasing level. When the maximum level is reached, a buzzer will sound as an alarm. The circuit uses a transistor, resistors, LEDs, and a bridge rectifier to convert AC power to DC and power the LEDs accordingly based on the water level connecting to different points in the circuit. This simple water level indicator circuit has various applications for monitoring water levels in tanks, reservoirs, and other containers.