I purchased this a year ago and used it for six months. It was very useful. I no longer need it, so I am selling it. It costs about 2400 yen new. I only used one sheet of 3M double-sided tape, so I only have one sheet left, but everything else is included. The box is also included. Shipping will be expensive because I will send it by courier, so please refrain from asking for a discount. I don't think there are any noticeable stains, but please understand that it is used. Operation has been confirmed. I will put batteries in it, so you can use it immediately. The following is the product description from when I purchased it. 【Emergency Call Bell】 This call bell is designed for the elderly and people with disabilities to call for help in an emergency and save rescue time. It is an emergency call bell that can send an SOS signal to caregivers/family by pressing the call button when in need. Ideal for the elderly, pregnant women, and patients. 【Easy to Use】 The receiver will sound when the button is pressed. You can choose from 38 melodies, and the volume can be adjusted in 4 levels from 25db to 110db as needed. Children and the elderly can also use it. It can satisfy various environments and requirements. 【Easy & Expandable】 When the button is pressed, the LED on the front of the receiver will light up blue and the call music will play, alerting you with sound and light. It can be installed without construction, so it is very easy. Also, you can add as many transmitters and receivers as you like. 【Stable Signal & Energy Saving & Waterproof Design】 The battery-powered transmitter is designed for energy saving, so it can be used continuously. It uses a high-sensitivity receiver and can receive up to 300m if there are no obstacles. Also, it has a waterproof rating of IP68, so it has excellent waterproof and dustproof performance. (Note: Do not submerge in water.) 【Package & Quality Assurance】 Includes: Transmitter (with strap) * 2, Receiver * 1, Screws + Tape, Japanese Instruction Manual * 1.