Standard size button cell will last 1 year. At the same time, there is a light sensor on the bottom of the product which stops working at night and does not interfere with rest It is very easy to use, just pull out the bottom sheet to start moving. Just plug it into the soil to make birds and frogs sounds, but it will stop when detected in the soil Death of most potted plants is caused by lack of water or excessive watering. This lovely soil humidity sensor reminds you to water when the soil is running out of water. Therefore, you don't need to worry about running out of water Cute design can be used as a flower pot decoration, make your garden more beautiful 4 colors Black/Blue/Red/Yellow to choose the one you like, Manufacturer: LEMEIGUO