Purchased this summer... I'm selling it because I haven't used it much, although I've worn it a few times. Cool in summer, warm in winter - usable year-round. Easy operation of cooling and heating modes with the controller. Equipped with 6 devices on the back. FEE: 3.7V/15000mAh Lithium-ion rechargeable battery: DC3.7V/15000mAh Input: DC5V 2A, 5V 3A, DC12V 3.5A (Type-C input only) Output: Type-A DC5V 2.1A, DC12V 3.5A Size: Approximately W80 x D92 x H25mm Weight: Approximately 720g (excluding battery) Full charge: Approximately 4 hours (estimated when using a commercially available Type-A adapter with a maximum output of 15W or more) Cooling mode: Approximately 8°C to approximately 26°C Heating mode: Approximately 30°C to approximately 43°C Color: Black Size: Free Length (cm): 38 Chest (cm): 86~110 Shoulder width (cm): 24 Outer fabric: 95% polyester, 5% polyurethane (stretch material) Lining: 100% polyester Accessories: USB battery *The Type-C cable for charging the battery cable is missing. Instruction manual included No box Item will be delivered as is. Operation confirmed Please understand that this is a used item. Thank you for looking.