【Operation Confirmed】All buttons have been tested for functionality using infrared checks. 【Exterior】There are no noticeable scratches, stains, or discoloration. 【Battery Case】There are no signs of battery leakage or rust. 【Batteries】Batteries are not included. Please prepare two AAA batteries. ※If the main unit does not respond, please check the battery level and the polarity of the batteries. ※To avoid interference, some remotes have remote control codes. If the remote control code does not match the main unit, it will not respond. Please refer to the instruction manual of the main unit. ※The product warranty is for 7 days after shipment. As this is a used item, we cannot exchange the product, and we will handle returns and refunds. Thank you for your understanding. ※We disinfect and clean the product during packaging, so please purchase with confidence.