GARMIN's FORERUNNER 255 with music playback function. - Brand: GARMIN - Model Name: FORERUNNER 255 MUSIC - Function: Music playback - Sensors: Heart rate sensor Thank you for viewing. All functions work without problems. The battery lasts for about 3-4 days with 24-hour wear and workouts. (It may last a bit longer depending on the heart rate monitor settings) I've used it for distances up to a full marathon without any issues. I haven't done an ultramarathon, so I'm not sure about that. I think it's perfect for your first Garmin. It weighs about 50g, and I've never felt the weight while running. When worn during sleep, recommended workouts are recommended based on sleep data. If you're sleep-deprived, the workout will be changed to a lighter one. The sticker or something on the bottom of the back of the main unit has peeled off. The pattern on the band? has worn off due to use, but there are no cracks, and it's still usable. It may take a little time to ship. The box and charging cable are included. The warranty has expired. I will disinfect it with alcohol before sending it. #Garmin #Forerunner