1. Most potted plant deaths are caused by water shortage or excessive watering. This lovely soil humidity sensor whistle when the soil is short of water to remind you to water the plants. So you don't have to too much for fear of water shortage. 2. Don't bother to look at the numbers on indicators, them when they call, and make your life easier. 3. Cute design can be used as an ornament for flowerpots to make your garden more beautiful. 4. It's very simple to use. Just pull out the plastic sheet at the bottom and it start to work. When you just insert it into the soil, it make the calls of birds or frogs, but once moisture is detected in the soil, it stop singing. 5. The standard size button battery can year. At the same time, there is a light sensor at the bottom of the product, which stop working at night to avoid disturbing your rest. 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