The Snuza Hero MD Baby Breathing Movement Monitor is a portable device that monitors your baby's breathing movements and alerts you if there are any potential issues. With a compact size of 7.3 x 4.3 x 2.9 cm and weighing only 40 grams, it is easy to use and battery-operated for convenience. The Hero MD model is equipped with a sleep sensor and alarm, making it ideal for monitoring your baby's breathing during naptime or bedtime. The device is designed for safety purposes and is medical certified, providing peace of mind for parents.