Item Type: Soil Moisture Alarm Meter Material: Resin Size: Approx. 17.3x8.5cm / 6.8x3.3in Battery Type: LR1130 Button Cell Battery (included) Battery Capacity: 70mAh1Accurate Control: The bird plant soil moisture tester can accurately read soil moisture, prevent over or under watering, and avoid affecting the growth of potted plants. 2Smart Design: It will whistle when the soil is short of water, reminding you to water the plants. Equipped with an automatic optical sensor that automatically turns off the "singing" alarm function at night. 3Premium Resin Material: The soil moisture tester is made of high quality resin material, durable. Cute designs can be used as decorations for flower pots to make your garden more beautiful. 4Easy To Operate: Use both indoors and outdoors, making it easy to know when to water your plants. The soil moisture meter is very simple to use and does not require any complicated operations. 5Cute Bird Design: Bird shaped soil moisture sensor, a perfect gift for planting enthusiasts. The battery can be powered up when the transparent film under the bird bottom is removed. 1 xSoilMoistureAlarmMeter