1Integrated design without settings, easy operation. 2Magnet design, compact and lightweight. Easily attach onto fish tank with wall thickness below 18mm. 3Point sensing, excellent performance. Automatically seamlessly switches to standby probe when the probe failure occurs. 4Equipped with a protective cover which can prevent foreign matter and sunlight interfering with the probe. 5With four color LED indicator lights, which will display the water level condition.Features: Integrated design without settings, easy operation.Magnet design, compact and lightweight. Easily attach onto fish tank with wall thickness below 18mm.Point sensing, excellent performance. Automatically seamlessly switches to standby probe when the probe failure occurs.Equipped with a protective cover which can prevent foreign matter and sunlight interfering with the probe.With four color LED indicator lights, which will display the water level condition.Anti-overflow protection design and will automatically cut off power when water level is too high. Specification: Material: ABS Color: Black Plug: US Plug Voltage: 100-240V Water Pump Flow: 4 W Flow Rate: 280 L/H Indicator light: High level sensor (slow flash); Low sensing point (green light); No water (lights out) Packing List: 1 x Aquarium Water Level Controller 1 x Magnet Probe 1 x Protective Cover(Style Random) 1 x Pipe Fixing Base 2 x Transparent Screw 1 x Hose 1 x Power Plug 1 x User Manual Usage Step: 1. Install the probe. The water level is below or in the middle of the probe. 2. Firstly plug in the power supply, and then plug in the water pump. 3. The system will automatically add water to the high sensing point. 4. Pump water to make the water level lower than the low sensing point, and test whether the system will automatically add water back. Warm Tips: 1. During test, quickly lower the water level or pick up the probe. It may not fill water because there is residual water at the tip of the probe. Gently shake the probe to detach the water attached to the probe. 2. The protective cover can prevent foreign matter and sunlight interfering with the probe. It is recommended to install it after normal testing. Environment Change: Because the system will calculate the appropriate amount of water supplement according to the size of the fish tank and form the protection time of adding water, the initialization operation should be carried out according to the above steps when replacing the fish tank, otherwise the situation of excessive or insufficient water supplement may occur. Shut Down Alarm: In the case of abnormal induction and wrong operation, such as: bucket water shortage, single add water more than 1 cm, the system will stop and giving out quick flashing light