Purchased new six months ago and stored after only one use. Operation has been confirmed. Battery is included, although the remaining battery life is unknown. *Box and instruction manual are not included. Retail price: 5,478 yen ☆How to Use☆ ① Lay the infant on their back and attach this product to the diaper. ② Press the power button, and each lamp (red and green) will flash, starting operation. ③ If the baby does not move for about 20 seconds, an alarm will sound. Please purchase only if you understand that this is a used item.