The Water Bottle Lick Detector is a compact, battery-powered device designed to monitor licking behavior of mice and rats directly in their home cage. It seamlessly attaches to most standard laboratory water bottles, enabling effortless setup without cage modification. Each lick is detected with high sensitivity and transmitted via Bluetooth to an Android tablet, allowing real-time monitoring and data collection. Multiple detectors can be used simultaneously, making it possible to track different liquids or compare consumption across groups. This system provides a reliable, wireless solution for studying drinking behavior in rodents.