Used 2 or 3 times. After use, I cleaned it thoroughly with tap water as instructed, wiped it with tissue, and took care of it, so there are no noticeable stains. Also, before listing, I tested it with saline solution on gauze as per the instructions to check the operation, and it worked fine. However, this is a used item handled by a non-professional, so please purchase only if you understand this. *The instruction manual has creases because it was included in the box. *The battery may have low remaining power. [For Humans] Bedwetting Alarm MDK [Bedwetting Monitor Wet Stop 3] WET STOP3 Bedwetting Prevention Alarm Therapy, Japanese Specification Authentic Product, Target: Around 5 years old to elementary school students, Entrance/Enrollment, Medical Institution Recommended Device Bedwetting alarm that alerts with sound and vibration - Model Name: Wet-Stop 3 - Function: Alerts with sound and vibration - Accessories: Instruction manual, charging cable - Package: Original packaging Thank you for viewing.