Purpose: Keep food fresh and dry. Specification: Material: High-quality ABS material, resistant to high and low temperatures. Non-toxic and durable Size: 9.7 cm * 3 cm Battery: 1.5 V, 2 AA batteries, only alkaline batteries (not included) can be used. User Manual: 1. The machine will not generate heat immediately after installing new batteries. Press and hold for 3–5 seconds to activate heating. 2. Use only new batteries. Do not mix battery polarities. Ensure batteries are correctly installed; otherwise, the device will not generate heat. 3. After proper battery installation, press and hold the device for 3 to 5 seconds to start heating. 4. For thicker plastic bags, move the bag slowly through the device to allow even heat distribution for optimal sealing. 5. There is no need to remove the batteries after use. Simply slide the hook between the device to disconnect the contact points of the metal parts. Tips: Avoid applying excessive pressure. Over-pressing may deform or damage the heating elements. The plastic bag must be clean and free of oil or moisture before sealing.