This is an adapter that converts SR44 or PR44 batteries to the appearance of an MR-50. By setting an SR44 or PR44, you can use it as an MR-50. LR44 batteries can also be installed in terms of size, but due to voltage characteristics, operation may become unstable as the battery is consumed, so their use is not recommended. If you purchase multiple battery adapters currently on sale, including this product, we offer a combined discount. Please let us know the required quantity in the comments for a separate quote. *This product will be shipped via regular mail and will not be delivered on weekends or holidays. If you are in a hurry, you can change to Yu-Packet by paying the difference in shipping costs, so please let us know in the comments. 【Terms of Transaction】 ・By purchasing this product, you are deemed to have agreed to all of the following: ・We are not responsible for any equipment failure or related damages caused by using this product. ・In some cases, we may refund the product price by canceling the transaction, but we will not provide any compensation exceeding the product price. ・We do not greet at the beginning of the transaction. If you value communication, please refrain from purchasing. (We will respond promptly to any questions.) ・Shipping will be done within the number of days stated in the "Days until shipment" in the product details. The number of days is calculated based on Mercari's standards. ・We cannot provide detailed shipping dates.