I purchased this but never had a chance to use it, so it's still unopened. This is a wearable sleeping bag with a multi-function heater, offering comfortable warmth with 3-level temperature adjustment. - Size: S - Battery Capacity: 20000mAh - Heater Sheets: 6 - Temperature Adjustment: 3 levels (Low 40-45℃, Medium 50-55℃, High 60-65℃) Thank you for looking.