Easy to use: No batteries or electricity needed, plug and useEasy observation: this water level indicator can show the water level to remind you to waterWidely Used: This water level indicator is used for flower pots, a perfect tool for indoor and outdoor useImportant note: If there is no water in the pot, the buoy of the water level indicator is at the bottom. With that in mind, pull the water level and aquatic plants through the holeSize: . 20cm longMaterial: plasticColor: white + blackPackage content:4 x water level indicatorOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.