Professional non-contact precise sleep monitoring & analysis devise validated in a sleep lab. Sleep sensor allows you to identify sleep patterns & take informed measures to tackle them. Detailed recording of respiratory rate, heart rate, & sleep phases with precise measurements. Works in conjunction with the Beurer free Sleep Expert app. Used in conjunction with the Beurer free sleep expert app for graphic display of recorded data by day/week/month. Clinical results suitable to be taken to a health professional for further analysis if necessary. Fresh wake function alarm so that within a specified time setting will wake you up whilst in your lightest sleep. Offers tips and advice on how to improve your sleep pattern. Moon phase display. Size H17, W1, . Weight 0.23kg. Manufacturers 3 year guarantee.