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Don't Throw Away Your Old Sleeping Bag! With This, It Instantly Becomes a "Constantly Warm Bed" - Intelligent Heating Sleeping Bag Liner, Keeping You Warm for Over 1-2 Years Traditional sleeping bags lose warmth after 1-2 years? Don't worry!Intelligent Heating Sleeping Bag LinerTo rescue your outdoor sleep: Old Sleeping Bag's "Warm Resurrection Armor"No need to replace the sleeping bag; directly upgrade its warmth to keep the sleeping bag that has accompanied you for many years "in service," saving money and being eco-friendly. 65℃Constant Temperature Warm Lock Black Technology: The thirty heating zone alloy fiber evenly heats up to a maximum of 65℃Even on cold nights, staying in bed feels like spring. Outdoor Sleep "Smart Thermostat"Three-level temperature control + microcomputer chip precise adjustment, 30-second rapid heating, continuous heating for 5-9 hours, uninterrupted warmth all night long. Lightweight Camping CompanionUSB interface charging, portable and easy to carry, giving you "bed-level" warmth anytime, anywhere in the tent or during a picnic. With it, the old sleeping bag is no longer a 'cold palace prop'; outdoor sleeping will no longer be 'bone-chilling', providing endless warmth!