I purchased this new at a store as a gift. Since the recipient already had one, I'm selling this one. There is no receipt, so there is no warranty. Manufactured January 2025 ◾︎Product Features ・Large capacity battery: 700mAh Using it for 15 minutes at a time, it can be used for about 5 days on a single charge. ・Lightweight: 145g Easy to carry and use anywhere, such as at home, in the office, or on a plane. ・Unique design U-shaped ring neck curve It is comfortable to wear for long periods and does not slip off. ・Adopts a 3D floating electrode sheet ・Silent mode Voice guidance can be turned OFF, so you can use it without worry in public places such as the office or during travel.