Soil meter designed for home and garden plants. No batteries or electricity. Instant water level indication: dry - add water to your plants; wet - drain your planter from extra water; moisture - no need to add water. Greenbo"s main guidelines are based on simplicity, innovation and efficiency, while keeping safety as the prime prerequisite. Greenbo cares about green environment and act according to the “sustainability” ecological economics principles, by using high quality & recycled materials to ensure long lasting product life cycle.