Soil Moisture Sensor Meter Moisture Sensor Hygrometer for Garden Soil Moisture Tester (Battery Included) Features:Accurately to read soil moisture for preventing exceive or insufficient watering. With automatic optical sensor, it can automatically turn off the "singing" alarm function at night. Made from premium material for durability and long service life. Both for indoor & outdoor use:Easily know when to water for your plants. Bird shape, cute and adorable, perfect gift for planting enthusiasts. Start-up method:After removing the transparent film under the bird seat, the battery will be electrified. If you want to turn off the singing function, please insert the probe into the wettest soil. Specification:Condition:100% Brand new Material:Resin+Metal Overall length:17.5cm / 6.89in Length of probe:12.6cm / 4.96in Bird height:8.6cm / 3.39in Bird width:3.6cm / 1.42in Package weight:approx.62g Color:Blue / Red(Optional) Package List:1* Soil Moisture Sensor Meter Notice:1. After inserting the probe into wet soil, the singing function will stop. But If the singing function is still there, please water the plants. If the product sings automatically in sunlight, it means that the electricity is sufficient. 2. Probe tips need cleaning regularly with fine abrasive paper. 3. The PH value of soil should be between 3 and 8. 4. Watering is required when it sings every 15 seconds. 5. Please allow slight error due to manual measurement and make sure you do not mind before ordering. 6. Please understand that colors may exist chromatic aberration as the different placement of pictures. Sings:When your plant needs to be watered.