Thank you very much for viewing this item 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 charge anywhere as long as there is a USB port. - It can be recycled, which 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 and efficiency. It has an LED indicator light that turns 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 higher Output: DC 4.2V ±0.1V [Note] Only the 2 slots in the middle of the diagram (2 and 3) are charging slots, so only 2 can be charged simultaneously. The outer slots 1 and 4 are "slots where charging does not occur just by placing the battery." Thank you for your consideration.