This is a LED humidity instrument. It is made of PP, PCB and ABS material, durable to use. Just plug the moisture instrument into your potted plant, you will know if you should water it by looking at its light color. Features -Color: White -Material: PCB, ABS, PP -Size: 15.50X2.50X0.60cm/6.09X0.98X0.24in Battery: , or - Suitable for users to maintain indoor plants and flowers, and suitable for various , plant and flower moisture testing - With two detection modes: manual and automatic - When the moisture content is right, the will flash every two hours, and if the is dry and the yellow light will flash 3 times every two hours. - The is extremely dry, and a flashes every 6 seconds, which means that it needs to be watered immediately - Always remind you to water your potted plants Package list: 1 x moisture sensor