This Secrui Wireless Door Open Chime Model M508 Receiver is a must-have for any home. With its easy installation and wireless connectivity, you'll never miss a visitor again. The chime comes in a sleek white plastic finish, and the oval-shaped button is made of durable plastic. Included in the bundle are the doorbell receiver, button, screws, battery, and double-sided tape/patch. The chime is powered by either battery or wall plug-in, making it suitable for any home. With features like a portable bell/chime and the ability to personalize, this door chime is perfect for any homeowner.