This is a set of 3 unopened items. Brand: MAMORIO Features: World's smallest class / MAMORIO Spot 700 route / AR compatible / Loss prevention alert / Cloud tracking / Significantly improved performance Product Dimensions (L x W x H): 35 x 19 x 3 mm Item Weight: 3 grams Compatible Devices: Computer, Smartphone Manufacturer: MAMORIO Notifications when you might forget something: When you move a certain distance away from MAMORIO, your smartphone will notify you to prevent you from leaving it behind. *The effective range is about 60m, and it does not have GPS, so real-time tracking is not possible. Check where it is: By linking with your smartphone, you can check the last time and place of items with MAMORIO attached, such as keys, wallets, bicycles, and motorcycles, from the app. Battery life: Approximately 1 year under normal use. The battery in this product cannot be replaced by the customer. By installing MAMORIO's unique antennas at lost and found centers of railways, buses, and commercial facilities, the owner will be notified of the location where the item with MAMORIO was found when it arrives at the lost and found center. Even if you lose your smartphone, you will be notified of the location by email when the smartphone with the MAMORIO app arrives at a MAMORIO Spot. You can also check the delivery destination on your computer when you lose your smartphone. (*It is assumed that the smartphone is turned on.) You can easily start using it by simply installing the app on your smartphone and bringing MAMORIO close to it. Color: Black