After removing the transparent film behind the bird seat, the battery be electrified. If you want to turn off the singing function, please two probes at the same time, or insert the probes into the wettest soil. After inserting the probe of the humidity sensor into the soil, the singing should stop after a moment. If the singing continues, please water your potted plants. The built-in automatic optical sensor automatically turn off the singing reminder function at night, but it still automatically sing when it senses sunlight to indicate sufficient power. Watering: Watering is required every 15 seconds when singing. Colour:Yellow Material:Resin Size:18 x 9cm Package Contents: 8 x Soil Moisture Meter Note: Fine abrasive paper and steel wool may be required to clean the tip of the probe regularly. It can sense the pH value of the soil and detect whether the soil fertility is too low. If you continue to sing after watering, check the pH value of the soil. The pH value of indoor plants