Purchased Feb 6th, 2024. Newest Model! It helped me achieve my goals and I no longer need it as I’m just focused on maintaining now. I purchased the tracker directly off the Lumen website in February. Thoroughly sanitized and comes with box and all pieces including the instruction manual and tips. The app subscription is separate on the lumen website and accessed in your phones apple / android App Store. The box has a small indentation from original shipping but it’s just a box. The device is in perfect condition as is all parts and will come fully charged. With Lumen, you can measure your metabolism in a single breath. Lumen reveals your body's fuel source and guides you toward optimal metabolic health. Once available only to top athletes in hospitals and clinics, metabolic testing is now available to everyone. Lumens CO2 sensor determines the CO2 concentration in a single breath. This indicates the type of fuel your body is using to produce energy (carbs or fats) and is the key to understanding how your metabolism functions. The main player behind health, weight loss, energy, longevity and metabolism.