This is an activity meter from Omron. This activity meter measures not only steps like a pedometer, but also calorie consumption. Nowadays, you can measure these things with smartphones and smartwatches, but it's useful for those who don't have a smartwatch but want to track their activity at home without carrying their smartphone. It distinguishes between walking on flat ground and walking up stairs. (My smartphone app can't do this.) It measures various body movements, such as walking, climbing stairs, housework, and desk work, and informs you of your daily calorie consumption. You can set goals, and it displays your effort level towards your goal. ・Manufacturer: Omron Healthcare Co., Ltd. ・Product Name: Omron Activity Meter HJA-401F CaloriScan ・Model Number: HJA-401F ・Color: Red ・Size: 33mm (H) x 78mm (W) x 12mm (D) ・Weight: Approximately 27g (excluding batteries) ・Power Supply: DC3V (Lithium battery CR2032 x 1) Operation confirmed. ＜Display Items＞ ・See photo 6 ・Past data can be displayed up to 7 days ago ＜Accessories＞ ・Fall prevention strap ・Strap clip ＜Instruction Manual & Quick Guide＞ I scanned and discarded both, but you can find them by searching for "HJA-401F Instruction Manual" and "HJA-401F Quick Guide". ※ I haven't confirmed whether the "Health Support Service" mentioned in the instruction manual is still available. I bought it but hardly used it. Therefore, the main unit has no scratches or scuffs and I think it's in good condition. Please understand that this is a used item.