Thank you very much for viewing our product from among many others. [Product Contents] ① Pin-type rechargeable lithium battery LIR425 1 pack (5 batteries) ② USB charger (with 2 rechargeable lithium batteries LIR425) ・You can always charge anywhere with a USB port. ・Since it can be recycled, it reduces costs and is environmentally friendly. ・With 7 batteries, you can enjoy fishing at your leisure. The charger for this product uses a smart chip for charging, overcharge protection, and high safety efficiency. With an LED indicator, it lights up red while charging and green when charging is complete. The charger is highly durable. It can be used after charging for 8-10 hours. Input: DC 5V 0.5A or more Output: DC 4.2V ±0.1V [Caution] Only the middle 2 slots in the diagram are charging slots (2, 3), so you can actually charge 2 batteries at the same time. Slots 1 and 4 on the outside are "slots that do not charge just by placing the battery." Thank you for your understanding.