Guardian+The Hubble Guardian+ is more than just a wearable monitor its your quiet guardian in the night, offering insight and comfort when you wish you could always be by their side. Gentle, smart, and intuitive, it tracks your babys heart rate, oxygen levels, movement, and temperature, while acting as a soothing audio monitor and nightlight. With Guardian+, you carry more confidence than ever that youll know when your baby needs you most.