This is not a standalone product!
You need the wireless soil moisture monitor, also available in our webshop. You can install up to 3 sensors with the wireless soil moisture monitor and switch between the 3 sensors with the CH-button on the monitor. The sensor measures the soil moisture percentage and the temperature of the soil. You can use the sensor both indoors and outdoors. The sensor uses 3X AAA batteries. They last approximately 1 year. For more information, see the description of the product wireless soil moisture monitor with sensor.