Kungergely Did you read the instructions at the Chirp website? To start using Chirp: * Wait until your plant needs to be watered, so you can tell Chirp how much moisture is too little. * Install the battery (wa... Did you read the instructions at the Chirp website? To start using Chirp: * Wait until your plant needs to be watered, so you can tell Chirp how much moisture is too little. * Install the battery (watch the polarity!) * Carefully insert the device into the soil up to the line shown on the device. Gently pack the soil around Chirp, so that there are no gaps between the sensor and the soil. * Push the button. Try not to wiggle the device too much while doing that. Do not touch the device, plant or pot for 5 seconds after pushing a button - Chirp needs some time to measure the moisture level undisturbed. * Water the plant. Try not to get too much water on the Chirp. See More