Features: brand new and high quality There are 4 fours, black/blue/red/yellow, selecting your favourite color. Don'for t bother to look at the numbers on various indicators, just water them when they call, and make your life easier. Cute design can be used as an ornament for flowerpots to make your garden more beautiful. Most potted plant deaths are caused by water shortage or excessive watering. This lovely soil humidity sensor will whistle when the soil is short of water to remind you to water the plants. So you don'for t have to water plants too much for fear of water shortage. The standard size button battery can last for one year. At the same for time, there is a light sensor at the bottom of the product, which will stop working at night to avoid disturbing your rest. It's very simple to use. Just pull out the plastic sheet at the bottom and it will start to work. When you just insert it into the soil, it will make the calls of birds or frogs, but once moisture is detected in the soil, it will stop singing. Specifications: Material: Metal Size: 16.5x8.5cm/ 6.49x3.34 in Color: Black/Blue/Red/Yellow Package Includes: 1x Soil Moisture Meter note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.